Inspired Kelpie2(G/U)(G/U)
Creature - Beast
Whenever you draw a card, you may pay GU. If you do, Inspired Kelpie gets +3/+3 and gains flying until end of turn.
3/3
Brawler Recruit2RG
Creature - Human Berserker
First strike, trample
Whenever Brawler Recruit attacks, another target attacking creature you control gains your choice of first strike or trample until end of turn.
3/2
Mimics' Essence4UU
Legendary Enchantment
You may have Mimics' Essence enter the battlefield as a copy of any artifact, creature, or enchantment on the battlefield, except its name is still Mimics' Essence, it's legendary in addition to its other types, and it gains "4UU, T: Exile Mimics' Essence, then return it to the battlefield under your control."
Honed Efficiency2U
Enchantment - Aura
Enchant artifact or creature
Enchanted permanent's activated abilities cost up to 4 less to activate. This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
Dega Auramage2W
Creature - Human Wizard
Kicker B and/or R
When Dega Auramage enters the battlefield, return target aura card with converted mana cost 3 or less from your graveyard to the battlefield.
If Dega Auramage was kicked with its B kicker, it has lifelink.
If Dega Auramage was kicked with its R kicker, it has haste.
2/3
Edit: Well, this is way late, as it was meant for Spark of Fervor, but it works for the following two as well.
Death's Familiar1B
Creature - Thrull
Morbid — Sacrifice Death's Familiar: Add BBBB to your nama pool. Activate this ability only if a creature died this turn.
1/1
Mindstabbing Agony2B
Sorcery
Kicker-Sacrifice a permanent.
Target player discards a card at random. If Mindstabbing Agony was kicked, that player loses life equal to the discarded card's converted mana cost.
Reversal of Boons1B
Instant
Remove all counters from target permanent, then put X -1/-1 counters on it, where X is one plus the number of counters removed this way.
Glaze Flutter1W
Enchantment Creature - Illusion
Flying
Whenever another enchantment enters the battlefield under your control, Glaze Flutter gets +2/+2 until end of turn.
0/1
(Note that this is the enchantment version of Glaze Fiend.)
Expand the Horizon3GG
Sorcery
For each basic land type among lands you control, search your library for a land of that type and put it into the battlefield tapped.
Creature - Beast
Whenever you draw a card, you may pay GU. If you do, Inspired Kelpie gets +3/+3 and gains flying until end of turn.
3/3
Creature - Human Berserker
First strike, trample
Whenever Brawler Recruit attacks, another target attacking creature you control gains your choice of first strike or trample until end of turn.
3/2
Legendary Enchantment
You may have Mimics' Essence enter the battlefield as a copy of any artifact, creature, or enchantment on the battlefield, except its name is still Mimics' Essence, it's legendary in addition to its other types, and it gains "4UU, T: Exile Mimics' Essence, then return it to the battlefield under your control."
Enchantment - Aura
Enchant artifact or creature
Enchanted permanent's activated abilities cost up to 4 less to activate. This effect can't reduce the amount of mana an ability costs to activate to less than one mana.
Artifact
BR, Sacrifice a creature: Target player loses X life, where X is the sacrificed creature's power.
Creature - Human Wizard
Kicker B and/or R
When Dega Auramage enters the battlefield, return target aura card with converted mana cost 3 or less from your graveyard to the battlefield.
If Dega Auramage was kicked with its B kicker, it has lifelink.
If Dega Auramage was kicked with its R kicker, it has haste.
2/3
Edit: Well, this is way late, as it was meant for Spark of Fervor, but it works for the following two as well.
Creature - Thrull
Morbid — Sacrifice Death's Familiar: Add BBBB to your nama pool. Activate this ability only if a creature died this turn.
1/1
Sorcery
Kicker-Sacrifice a permanent.
Target player discards a card at random. If Mindstabbing Agony was kicked, that player loses life equal to the discarded card's converted mana cost.
Artifact Creature - Gnome
Sacrifice Dropper Gnome: Gain 1 life.
0/1
Instant
Remove all counters from target permanent, then put X -1/-1 counters on it, where X is one plus the number of counters removed this way.
Creature - Insect
Deathtouch
At the beginning of your upkeep, put a +1/+1 counter on Virulent Scutes.
1/1
Enforced Lamentation 2BBEnchantment
Whenever a creature an opponent controls dies, its controller loses 1 life and discards a card.
EDIT: Beat by a few mins.
Extract from the Unwanted 2B
Enchantment
Whenever you cycle a card, you may pay B. If you do, target player discards a card.
Enchantment Creature - Illusion
Flying
Whenever another enchantment enters the battlefield under your control, Glaze Flutter gets +2/+2 until end of turn.
0/1
(Note that this is the enchantment version of Glaze Fiend.)
Sorcery
For each basic land type among lands you control, search your library for a land of that type and put it into the battlefield tapped.
Artifact
T: Add CC to your mana pool.
jk... can we use existing cards? I thought the spirit of the thread was that we shouldn't...
My actual submission below:
Evoker of Viridescence 2GG
Creature - Elf Druid
Whenever a basic land you control is tapped for mana, add G to your mana pool.
2/2