msem-instigator

First strike
Tesqua Cohort enters with a +1/+1 counter on it if you control another creature with a +1/+1 counter on it.

Lifelink
Bulwark — Whenever Tharanos' Sentinel attacks, if you control a creature with toughness 4 or greater, untap it.

Flying, lifelink
Whenever you gain life, each opponent loses 1 life.
{4}{B}{B}: Create a 1/1 black Vampire creature token with lifelink for each nontoken creature that died this turn.

Heroic — Whenever you cast a spell that targets Thassa's Shoreguards, tap target creature an opponent controls. It doesn't untap during its controller's next untap step.
Whenever Thassa's Shoreguards deals combat damage to a player, draw a card.

Flying
Whenever a creature attacks you or a planeswalker you control, put a -1/-1 counter on that creature.

Indestructible
At the beginning of your upkeep or when this creature transforms into The Divine Lovers, gain control of target permanent with mana value X or less until end of turn, where X is the number of creatures you control. Untap that permanent. It gains haste until end of turn.

Whenever The Ever-Pestilent deals combat damage to a player, that player discards a card at random.

Whenever an opponent activates an ability of a nonland permanent, destroy that permanent.
{3}{U}{B}{R}: Exile target creature or planeswalker card in a graveyard. Create a token that's a copy of it.

First strike, trample
Death knell — Return a permanent card with mana value less than X from your graveyard to the battlefield, where X is the mana value of the last creature that died this turn. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

The Oltenen Emissary is all colors.
You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast. When you do, you may cast spells without paying their mana costs until end of turn.

Permanent cards in your graveyard have The Undercity Amalgam's Adventure.
Once during each of your turns, you may cast an Adventure spell from your graveyard.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

As Theodore Harper, Head Librarian enters, choose Fact or Fiction.
• Fact — Permanent spells you cast cost {1} less to cast. This effect can't reduce the amount of mana a spell costs to cast to less than one mana.
• Fiction — When Theodore Harper enters, return a permanent card from your graveyard to your hand.

Flying, haste
Thermal Surger can't block.
When Thermal Surger enters, you may sacrifice a land or exile a land card from your graveyard. If you do, put a +1/+1 counter on Thermal Surger.

If a source you control would deal damage this turn, it deals double that damage instead.
Coalesce {7}{R}{R} (You may cast this from your graveyard for {7}{R}{R}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Haste

{2}{R}: Thespian Soldier gains first strike until end of turn.

When Thespian's Page enters, return target instant or sorcery card from your graveyard to your hand.

Reach
Whenever Thicketwalker attacks, you may tap or untap target land.

First strike
Other Foxes you control get +1/+1.
Whenever a Fox you control becomes blocked, it deals 1 damage to each creature blocking it.

When Third Legion Rider enters, if you control an embattled creature, tap target creature an opponent controls. It doesn't untap during its controller's next untap step. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

{1}{B}: Target Knight or Soldier you control gains deathtouch until end of turn.

Reach, deathtouch

Prismatic — Whenever you cast a multicolored spell, Thorny Bushwacker has base power and toughness 5/3 until end of turn.

Whenever a creature enters under an opponent's control, draw a card unless that player pays {1}.

When Thoughtgrinder enters, each player discards a card.
Unearth {1}{U}{B} ({1}{U}{B}: 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.)