Eternal Companion1B
Creature - zombie hound (u)
Whenever you cast a card from your command zone, you may return ! From your graveyard to the battlefield. If you do, gain 2 life.
2/1
Simmer Burst R
sorcery
! deals 2 damage to target creature or player,
Triple Miracle 1R (you may cast this for its Triple Miracle cost when you draw it if it's the first card you drew this turn. If you do, copy it twice. You may choose new targets for the copies.)
Nettle Spike1G
Creature - Spike (C)
Nettle 2 (This comes into play with N +1/+1 counters on it. When it's put into a graveyard, you may put its +1/+1 counters on a creature you control.) 2, Remove a +1/+1 counter from Nettle Spike: Put a +1/+1 counter on another target creature. That creature gets +2/+2 until end of turn. "They're evolving... no... morphing... no... I don't know what they're doing, but I don't like it!"
- Chimchim Charoo, Mogg Pedospeaker
0/0
Burning Conflux XR
Instant {U}
Converge - Burning Conflux deals damage to target creature and target player equal to the number of colors of mana spent to cast burning conflux.
Isn't that just a Lava Axe that does twice as much damage and caps at 4R? Converging Fireball feels good because X works like real X spells, but Burning Conflux is a real kick in the teeth. Psychologically, I realize you're giving me twice the damage until 4R, but emotionally I feel like you just nerfed my X spell. No Channel Fireball action here.
Was there ever an X converge burn spell? That'd be too feel bad to print, right?
Sorcerer of the Frozen Sea - So my spaceship has haste, but can't fly without wizards? WHAT? Also, this is clearly undercosted.
Vedalken Astronomer - 3 mana for infinite mana and a card? What's the catch?
Launch Pad - What's legendary about this? Why does it scry? What is going on???
Kraken of Frozen Mare - untap all islands = infinite mana combo; please no.
Flight Cadet - Not a soldier? This feels rather weak; I think you could get a 2/2 for 1W with vigilance. Never mind, you're just obsoleting Savannah Lions. Why not? I've got an island to sell ya - it taps for UUU, draws 3 cards, and then untaps if you haven't won the game yet.
Converging BlazeXR
Sorcery (R) Converge - ! deals X+Y damage to target creature or player, where Y equals the number of colors of mana used to cast this spell.
Converging Winds1R
Instant (U) Converge - ! deals X damage to target creature and target player, where X equals the number of colors of mana used to cast this spell.
I think this is rather fair. But I do feel kind of sad X can't be "full converged" to 5.
Maybe... Converging FireballXR
Sorcery
Converge - ! deals X+Y damage to target creature or player, where Y equals the number of colors of mana used to cast this spell.
Probably too close to The Ultimate Nightmare of Wizards of the Coast® Customer Service. But I really like the interaction of X with Converge... as long as X isn't "restricted" by Converge, and this avoids that. I could see a cycle of these X cards - yes, a cycle with the same mana costs and rarity - probably rare to avoid customer service...
The last option I can think of: Kicking Coverge1R
Instant
Converge - ! deals X damage to target creature or player, where X equals the number of colors of mana used to cast this spell.
Kicker 3
If you played the kicker cost, create a 1/1 red goblin creature token.
I could see a cycle or two of these Converge kicker spells; commons with colorless kickers and rares with splash kickers and effects.
Multitool3
Artifact - Equipment (R)
Equip 2
Equipped creature gets +2/+2.
"0: Choose haste, trample, vigilance, flying, or deathtouch. Until end of turn, a creature equipped by this has that ability. Plat this ability only once per turn."
Voidnothing, entombed. I'm a sucker for a good magus
Erratic Goblin1R
Creature - goblin berserker (u)
Haste, trample
When ~ enters the battlefield, reveal the top card of your library until you reveal a non-land card. ~ gets +x/+0 until end of turn, where x equals that card's converted mana cost.then put all revealed cards into your graveyard.
1/2
Restore life1W
Instant (u)
Gain 2, then you may return a creature card with a converted mana cost of X or less to the battlefield, where X equals the amount of life you gained this turn.
Spiders from the Eyes 1GB
Sorcery (u)
Destroy target creature, then create two 1/2 green spider creature tokens with reach.
Eternal Companion 1B
Creature - zombie hound (u)
Whenever you cast a card from your command zone, you may return ! From your graveyard to the battlefield. If you do, gain 2 life.
2/1
Simmer Burst R
sorcery
! deals 2 damage to target creature or player,
Triple Miracle 1R (you may cast this for its Triple Miracle cost when you draw it if it's the first card you drew this turn. If you do, copy it twice. You may choose new targets for the copies.)
Commander Flare 1R
Enchantment (r)
Whenever you play a card from the command zone, ! Deals 3 damage to target creature or player.
Nettle Spike 1G
Creature - Spike (C)
Nettle 2 (This comes into play with N +1/+1 counters on it. When it's put into a graveyard, you may put its +1/+1 counters on a creature you control.)
2, Remove a +1/+1 counter from Nettle Spike: Put a +1/+1 counter on another target creature. That creature gets +2/+2 until end of turn.
"They're evolving... no... morphing... no... I don't know what they're doing, but I don't like it!"
- Chimchim Charoo, Mogg Pedospeaker
0/0
Isn't that just a Lava Axe that does twice as much damage and caps at 4R? Converging Fireball feels good because X works like real X spells, but Burning Conflux is a real kick in the teeth. Psychologically, I realize you're giving me twice the damage until 4R, but emotionally I feel like you just nerfed my X spell. No Channel Fireball action here.
Was there ever an X converge burn spell? That'd be too feel bad to print, right?
Vedalken Astronomer - 3 mana for infinite mana and a card? What's the catch?
Launch Pad - What's legendary about this? Why does it scry? What is going on???
Kraken of Frozen Mare - untap all islands = infinite mana combo; please no.
Flight Cadet - Not a soldier? This feels rather weak; I think you could get a 2/2 for 1W with vigilance. Never mind, you're just obsoleting Savannah Lions. Why not? I've got an island to sell ya - it taps for UUU, draws 3 cards, and then untaps if you haven't won the game yet.
Sorcerer of the Frozen Sea - Forgot something?
Converging Blaze XR
Sorcery (R)
Converge - ! deals X+Y damage to target creature or player, where Y equals the number of colors of mana used to cast this spell.
Converging Winds 1R
Instant (U)
Converge - ! deals X damage to target creature and target player, where X equals the number of colors of mana used to cast this spell.
I think this is rather fair. But I do feel kind of sad X can't be "full converged" to 5.
Maybe...
Converging Fireball XR
Sorcery
Converge - ! deals X+Y damage to target creature or player, where Y equals the number of colors of mana used to cast this spell.
Probably too close to The Ultimate Nightmare of Wizards of the Coast® Customer Service. But I really like the interaction of X with Converge... as long as X isn't "restricted" by Converge, and this avoids that. I could see a cycle of these X cards - yes, a cycle with the same mana costs and rarity - probably rare to avoid customer service...
The last option I can think of:
Kicking Coverge 1R
Instant
Converge - ! deals X damage to target creature or player, where X equals the number of colors of mana used to cast this spell.
Kicker 3
If you played the kicker cost, create a 1/1 red goblin creature token.
I could see a cycle or two of these Converge kicker spells; commons with colorless kickers and rares with splash kickers and effects.
Multitool 3
Artifact - Equipment (R)
Equip 2
Equipped creature gets +2/+2.
"0: Choose haste, trample, vigilance, flying, or deathtouch. Until end of turn, a creature equipped by this has that ability. Plat this ability only once per turn."
Ravenous Goblin R
Creature - Goblin Berserker (R)
Haste
When Cackling Goblin enters the battlefield, discard a card at random.
3/1
Night Screech B
Sorcery (c)
Target player discards a card. Gain life equal to that card's converted mana cost.
Madness - Sacrifice a creature.
Erratic Goblin 1R
Creature - goblin berserker (u)
Haste, trample
When ~ enters the battlefield, reveal the top card of your library until you reveal a non-land card. ~ gets +x/+0 until end of turn, where x equals that card's converted mana cost.then put all revealed cards into your graveyard.
1/2
Hopeful Academic UW
Creature - Human Cleric Wizard (R)
Lifelink
Whenever you gain life for the first time this turn, draw a card.
1/3
Restore life 1W
Instant (u)
Gain 2, then you may return a creature card with a converted mana cost of X or less to the battlefield, where X equals the amount of life you gained this turn.