msem-instigator

Colossal 2—{6}{U} (You may cast this for its colossal cost to have it enter with two +1/+1 counters; or pay {6}{U} as a sorcery: Put two +1/+1 counters on it if it has none.)
When Titanic Fathomclaw's colossal ability puts one or more counters on it, return target instant or sorcery card from your graveyard to your hand.

Whenever Titanic Hardshell deals combat damage to a player, draw a card.
{2}{G}: Titanic Hardshell gains trample until end of turn.

Enchant creature without flying
Enchanted creature gets +10/+0 and attacks each combat if able.

When Titou Louoe, Bayou Shaman enters, create a blue Aura Curse enchantment token named Curse of Impotence attached to target player. The token has enchant player and “Creatures enchanted player controls get -1/-0.”

Tizzanier Tidehunter can't be blocked as long as you control another Merfolk.

When To Go Beyond enters, draw a card, then choose a card name.
{2}{U}: Reveal a card you own from outside the game with the chosen name and put it on top of your library.

Creatures you control get +1/+1.
{3}{W}{W}, Sacrifice To a Bright Future: Put a +1/+1 counter on each creature you control.

Arm target creature you control. It deals damage equal to its power to any target. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Foretell {1}{B} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Create two X/X black Zombie creature tokens with menace, where X is the number of nontoken creatures that died under your control this turn.

{2}{B}, Exile a card from your graveyard: Tomb Creeper gets +2/+2 until end of turn.

Flying
Whenever another creature you control enters from a graveyard or you revive a creature token, Tomb Scavenger gets +2/+0 until end of turn.

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
When Tomb Steward enters, search your library for a card and put it into your graveyard. Then shuffle.

Reach
You may have other creatures you control enter as a copy of any creature card in a graveyard with equal or lesser mana value.

Whenever a nontoken creature dies, you may exile that card. If you do, return each other card exiled with Tome of the Lidless Gaze to its owner's graveyard.
At the beginning of your upkeep, if you control no Eyes, create a token that's a copy of a card exiled with Tome of the Lidless Gaze except it's a 2/2 Eye Horror with flying in addition to its other types.

Ward {2}
Even numbered spells you cast each turn costs {2} less to cast. (The second, fourth, sixth, etc.)

Primal {5}{U}{R} (During your turn, you may cast this spell for {5}{U}{R} instead of playing a land.)
Each player discards their hand, then draws seven cards. If this spell was cast for its primal cost, draw cards equal to the number of cards your opponents discarded this way.

You may put cards with mana value 2 or less that permanents you control explore into your hand as though they were lands. (You won't get the counter if you do.)
Whenever Torch of Those Underfoot attacks, it explores. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then you may put that card in your graveyard.)

Each player sacrifices three lands. Torment each player three times. (To torment a player, they lose 3 life unless they discard a card or sacrifice a nonland permanent.)

Attacking creatures you control get +1/+0.
Mirage {2}{R} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Winnow (Damage dealt to this creature also causes you to lose that much life.)
Sacrifice Tormented Echo: Target creature gains winnow until end of turn.

Flying
When Tormentor Harpy enters, if there are three or more creature cards in your graveyard, target creature an opponent controls gets -3/-3 until end of turn.

Flying
Ward—{2}, Pay 2 life.
At the beginning of your end step, if a card was put into or left your graveyard this turn, put a +1/+1 counter on Tormentor of Graves.

Glorious end — When Toros the Warchief dies, if it was tapped, return it to the battlefield at the beginning of the next end step.
Attacking creatures you control have deathtouch.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Vehicle becomes an artifact creature until end of turn.)