msem-instigator

Exile target creature, then return that card to the battlefield under its owners' control.

Counter target spell unless its controller pays {2}.

This spell costs {2} less to cast if you've cast another spell this turn.
Enchant creature
When Tire Out enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

When Titan of Lake Vasil enters, untap up to four target permanents.
{3}{U}: Draw a card.

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.

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.

Return target permanent you control to its owner's hand. (Then exile this card. You may cast the creature later from exile.)

You may tap or untap target nonland permanent.
Catalyze. (The next spell you cast this turn costs {1} less to cast.)

Tomb of Great Drakes enters tapped.
{T}: Add {U}.
{2/U}{2/U}: Tomb of Great Drakes becomes a 2/2 blue Elemental creature with flying until end of turn. It's still a land.

Whenever a creature you control attacks, you may sacrifice a Treasure. If you do, that creature can't be blocked this turn.

When Tombstone Looter enters, you may draw a card. If you do, discard a card.
Unearth {1}{U} ({1}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

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

Exile up to X target instant and/or sorcery cards with total mana value X or less from your graveyard. You may cast a copy of each card exiled this way without paying its mana cost. Exile Total Recall.

Target creature can't be blocked this turn. Scry 1.
Fabled {2}{U} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that creature.)

Enchant creature
Enchanted creature has hexproof.
{U}: Enchanted creature can't be blocked by target creature this turn.

Tap target creature, then draw X cards, where X is its mana value.

Vanguard — Whenever a creature you control attacks alone, draw a card.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Whenever a creature you control attacks and isn't blocked, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)

Enchant creature
When Transcendent Arts enters, draw a card.
Enchanted creature can't be blocked by creatures that don't share a creature type with it.

Draw a card. (Cast a copy of this spell once while this creature is on the battlefield.)

Wanderlust — When Transnaturalist enters, if you control four or more differently named lands, you may return target creature to its owner's hand.

Draw two cards. Then discard a card unless you attacked this turn.