Tempting Darkfiend enters with a flying counter on it unless an opponent pays 2 life. The same is true for menace, deathtouch, lifelink, and indestructible counters.

Deathtouch
{G}: Temptuous Crooner gains reach until end of turn.

Tenacious Snapvines enters with X +1/+1 counters and your choice of up to X different counters from among deathtouch, lifelink, vigilance, trample, menace, reach or ward {2} on it.
If damage would be dealt to Tenacious Snapvines, remove a +1/+1 counter and another kind of counter from it. If you do, prevent that damage.

At the beginning of your end step, you may pay {2}. If you do, you gain 2 life, then target opponent may pay {2}. If they don't, you draw a card.

Tenuous Edge enters tapped.
{T}: Add {U} or {R}.
{T}, Discard another card named Tenuous Edge: Draw a card.

As long as you've cast an instant spell this turn, Teqien Overseer gets +1/+1 and has hexproof.
As long as you've cast a sorcery spell this turn, Teqien Overseer gets +1/+1 and has flying.

{T}, Sacrifice Terramorphic Expanse: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

When Terror of Olantin enters, create a number of 1/1 blue Tentacle creature tokens equal to your devotion to green.

Menace
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, put two +1/+1 counters on Terror of Whitecliff Pass.

Teslahammer Giant enters with a +1/+1 counter on it.

Test Subject Alpha enters with a +1/+1 counter and a trample counter on it.
At the beginning of your upkeep, you may move a counter from Test Subject Alpha onto another creature.

{T}: Add {C}.
Spellcharge 4

Enchant player
At the beginning of each end step, enchanted player gains life equal to the amount of life they've gained this turn, then loses life equal to the amount of life they've lost this turn.

Flash
Whenever Thassa's Tideshaper attacks, defending player mills two cards and you draw a card. Then discard a card unless defending player has eight or more cards in their graveyard.

Defender, trample
At the beginning of combat on your turn, if you have at least 3 life more than than your starting life total, Thawing Yeti loses defender until end of turn. Otherwise, you gain 2 life.

[+2]: Each player puts their hand on the bottom of their library in a random order. You draw five cards, then each opponent draws two cards.
[+1]: Untap each land you control.
[–3]: Return up to three target nonland permanents to their owner's hands.
[–9]: You get an emblem with “Whenever an opponent casts their first spell each turn, gain control of it. You may choose new targets for that spell.”

Flying, vigilance
When The Army of Trax enters, create a number of 0/0 white Army creature tokens equal to your devotion to white. Then put that many +1/+1 counters on each Army you control.

Lifelink
Indulgence
Whenever you indulge, you may gain control of target nonland permanent for as long as you control The Beauclaire Family.

Whenever you cast a noncreature spell, creatures you control get +1/+1 and gain haste until end of turn.

If you would draw a card while your library has no cards in it, instead you may put a card you own from outside the game into your hand.
{T}: Draw two cards, then discard a card.

Exile up to one target permanent with mana value 4 or greater.
Create two 1/1 white Human creature tokens.
Each player gains control of all permanents they own. If you gained control of no permanents this way, draw a card.

When The First Battalion enters, create two 2/2 colorless Minion creature tokens with decayed.
Minions you control lose all abilities.

Whenever you cast a noncreature spell, choose one —
• Create a 1/1 white Human creature token.
• Target player mills three cards.
• Scry 2.

Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control.

When The Love of a Lifetime enters, you may search your library for a legendary creature card that doesn't share a name with a creature you control, reveal it, put it into your hand, then shuffle.
Creatures you control get +1/+1.