You may sacrifice a Plains and a Swamp rather than play Scapegoat Trial's mana cost.
Destroy target creature. If that creature is put into a graveyard this way, creatures you control get +2/+1 until end of turn.
Hissing Ambush -- XGG
You may exile a green card with converted mana cost X from your hand rather than pay Hissing Ambush's mana cost.
Put X 1/1 green Snake creature tokens with infect onto the battlefield.
Hissing Death Lord 1BG
Creature - Zombie Snake Lord
Snakes and Zombies you control gain ":symbg::Regenerate" and Swampwalk. x: Exile a card with converted mana cost X from your graveyard and put X 1/1 Zombie Snake tokens onto the battlefield that are green and black.
Hissing Ambush + Battering WurmXXG
Put X 4/3 green Wurm creature tokens with "Creatures with power less this creature's power can't block it" onto the battlefield.
If a player has been dealt damage this turn, put a +1/+1 counter on each of those creatures.
Hissing Death Lord + Flowstone Channeler Flowstone Whisperer2(B/G)R
Creature - Zombie Snake Spellshaper (M) 0: Target Zombie or Snake you control gets +1/-1 until end of turn. T, Discard a card: Each other Zombie and/or Snake you control gets +1/-1 until end of turn.
Taseva, Clans' Foundation2GW
Legendary Creature - Avatar
When Taseva, Clans' Foundation enters the battlefield, put a 1/1 green and white Human creature token onto the battlefield for each creature you control.
Taseva's power and toughness are each equal to the number of creatures you control.
When Taseva leaves the battlefield, exile each creature you control.
Setharniel, Who Guides The Flock6WW
Legendary Creature - Avatar
When Setharniel, Who Guides The Flock enters the battlefield, put four 1/1 white Bird creature tokens with flying onto the battlefield.
Creature - Basilisk
Whenever a creature dealt damage by Chronian Basilisk is put into a graveyard from play, it's controller puts an 0/2 colorless Wall artifact creature token with defender onto the battlefield.
Whenever Chronian Basilisk leaves the battlefield, if it wasn't a token, put a token that's a copy of it onto the battlefield.
Chronian Basilisk + Oxidda Golem
Noxious Wraith </tRonG>4B
Creature - Wraith
Affinity for Swamps
Whenever ~ leaves the battlefield, if it wasn't a token, put a token that's a copy of it onto the battlefield.
Tap a basic non-swamp you control to add a noxious counter to ~.
:symtap:: Remove a counter to add BB to your mana pool.
Exile ~: Deal 1 damage to target player for each counter on ~. The smells are worse than that of what comes out of orcs after lunch.
Creature - Zombie Beast
Deathtouch, haste, lifelink
Whenever Curse Paramount leaves the battlefield, return all creature cards from all graveyards to their owners' hands.
(The tricky part was finding a way to make those colors work... and make sense)
Creature - Giant Barbarian
Protection from blue
Blue creatures get +1/+1. "Your cunning is admirable, my diminutive foe, but I am afraid you are not properly armed to fight me head-on. Take my axe!"
Creature - Giant Knight
Other nonartifact creatures you control get +1/+1 and have defender "Stay back here. I'll go on ahead and clear the way."
Arkon Siege Master 2(W/R)(R/W)
Creature - Giant Soldier
Other nonartifact creatures you control get +1/+1 and have trample T Discard two cards from your hand at random: Deal 4 damage to target creature.
Creature - Human Wizard
:symtap:: Choose target spell or permanent, then discard two cards at random. If both discarded cards share a type with that spell, counter that spell. If both discarded cards share a type with that permanent, destroy that permanent.
Creature - Treefolk Druid
Shroud, vigilance T: The next time target creature you control would be dealt damage, prevent that damage. Put a +1/+1 counter on that creature for each 1 damage prevented this way.
Disciple of the One Hundred Eight Trials3GW
Creature - Human Monk Warrior
:2mana:: Disciple of the One Hundred Eight Trials gains double strike until end of turn.
:4mana:: The next time Disciple of the One Hundred Eight Trials would deal damage this turn, instead prevent that damage and put that many +1/+1 counters on it.
Disciple of the One Hundred Eight Trials (now that is a name) + Painsmith (huh, that's rather... recent)
Flaming Cloud Jumper1WW
Creature - Human Spirit
Whenever you cast an artifact spell, you may have Flaming Cloud Jumper gain flying until end of turn.
Whenever you cast a creature spell, you may have Flaming Cloud Jumper gain first strike until end of turn.
Whenever you cast an enchantment spell, you may have Flaming Cloud Jumper gain lifelink until end of turn.