msem-instigator

{T}: Tap target creature.
{T}: Draw a card, then discard a card.
Whenever another artifact you control enters, untap Telemin Architect.

Defender
Whenever another creature deals damage to Temperate Gazebo, you gain 3 life.

When you unveil Tempest Termagant, you may put target land on top of its owner's library.

Flying
Other creatures you control with flying get +1/+1.

Concord — Temple Attendant gets +1/+1 and has indestructible as long as there are four or more card types among permanents you control.

{T}: Add {C}.
{2}, {T}: Add two mana in any combination of colors.

Defender
Other untapped creatures you control get +0/+1.
Each other creature you control can block an additional creature each combat.

Target player reveals their hand. You and that player secretly choose a nonland card from it. Then those cards are revealed. That player discards the chosen cards.

Enchant permanent
When Tempted by Lotuses enters, enchanted permanent's owner creates three colorless artifact tokens named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
You control enchanted permanent.

Whenever one or more cards leave your graveyard for the first time each turn, create a 3/2 green Crocodile creature token with trample.

Enspirit (As you cast this spell, you may exile a nonenchantment creature you control until this leaves the battlefield or fails to resolve. Reduce this spell's cost by the exiled card's mana value.)
Tenacious Brawler enters with X +1/+1 counters on it.

Discard a card: Tender Warden gets +2/+2 until end of turn. Activate only during your turn.

{T}, Pay 1 life: Add {R} or {W}.
{2}, {T}, Sacrifice Tenement Alley and another permanent: Draw a card. Activate only during your turn.

{T}: Add one mana of any color.
{X}: Terracotta Idol becomes a Spirit artifact creature with base power and toughness X/X until end of turn. Activate only as a sorcery.

You may have Terracotta Legion enter as a copy of any creature with mana value 1 or less you control, except it's an artifact in addition to its other types.

Target creature you control gets +X/+X until end of turn, where X is the number of lands you control.

Choose target opponent. Scry 3, then reveal the top card of your library. The chosen player discards an amount of cards equal to that card's mana value. (To scry 3, look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Voracious 2 (As this enters, you may sacrifice up to two artifacts and/or creatures. This creature enters with that many +1/+1 counters on it.)
When Territorial Bear dies, you may return up to two target artifact cards from your graveyard to your hand.

Vigilance
When Territorial Camaar enters, you may sacrifice a land. If you do, search your library for a Desert card, put it onto the battlefield tapped, then shuffle.

When Terror of the Ontarachie enters, choose one —
• Each player sacrifices a creature.
• Each player loses 5 life.

Return target creature you control and target creature you don't control to their owners' hands. Target player discards a card.
Coalesce {4}{U}{B} (You may cast this from your graveyard for {4}{U}{B}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Terrors of Cuxuri Trench can't block.

Create an X/X green Mutant creature token.
Draw a card.

Target creature you control explores. When it does, it deals damage equal to its power to target creature or planeswalker. (Reveal the top card of your library. Put it into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then you may put that card in your graveyard.)

Enchant opponent
Whenever enchanted player draws a card or casts a spell, put a foreshadow counter on Thalassophobia.
Remove eight foreshadow counters from Thalassophobia and sacrifice it: Create an 8/8 blue Kraken creature token.

First strike
Each other nontoken creature you control enters with an additional +1/+1 counter on it.