msem-instigator

When Cobbled Currency enters, discard a card, then draw a card.
{3}, Sacrifice Cobbled Currency: Discard two cards, then draw two cards.

Primal {W} (During your turn, you may cast this spell for {W} instead of playing a land.)
When Captured Paletusk enters, you may search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle. You gain 2 life. Then sacrifice Captured Paletusk if it was cast for its primal cost.

Search your library for a card, put it into your graveyard, then shuffle. (Then exile this card. You may cast the creature later from exile.)

Equipped creatures you control get +1/+1 for each Equipment attached to them.
Whenever Cyrukan's Devoted attacks, create a Weapon token and attach it to target attacking creature you control. (It's an Equipment artifact with equip {2} and “Equipped creature gets +1/+1.”)

Cast Khalizors' Last Stand only during your postcombat main phase.
Gain control of target creature until end of turn. Untap all creatures you control. They gain haste until end of turn. After this phase, there is an additional combat phase followed by an additional main phase.

Enchant creature
Enchanted creature gets +3/+3 and has trample.

Target creature gets +2/+2 until end of turn. If it's an artifact creature, it gains indestructible until end of turn.

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)
As long as Daring Cavalier is renowned, it has trample.

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

Target opponent sacrifices a creature. Put a +1/+1 counter on up to one target creature you control.

Fertile Steppe enters tapped unless you have 15 or less life.
{T}: Add {G} or {W}.

When Timecrafter Lafterii enters, choose target permanent with one or more time counters on it, then put two time counters on it or remove two time counters from it.

Exile target artifact, enchantment, or creature with flying.

({T}: Add {U} or {B}.)
Flooded Morass enters tapped unless you control a basic Island or a basic Swamp.

Target creature you control gets +1/+1 until end of turn. It fights target creature you don't control.

Harsh Wastes deals 3 damage to target attacking or blocking creature.

Deathtouch
Whenever Withered Elk deals combat damage to a player, that player loses half their life, rounded down.

Return target creature card from your graveyard to the battlefield. That creature is a black Elemental in addition to its other colors and types. Upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying
• Lifelink

Target opponent discards two cards. You gain 2 life. (Then exile this card. You may cast the creature later from exile.)

Vanishing 3 (This permanent enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a creature dies or a time counter is removed from Mourn the Lost, you may tap target creature.

When Caer Crann Borderscout enters, you may search your library for a basic land card, reveal it, and put it into your hand. If you do, shuffle.

Concord — When Coral Bruiser enters, if there are four or more card types among permanents you control, put target creature you don't control into its owner's library third from the top.

Whenever a creature enters under your team's control, reveal the top card of your library. If it's a creature card, you gain 2 life.

Trample
{2}{R}{G}: Creatures you control get +1/+1 until end of turn.

{T}, Sacrifice an artifact: Add {R}{R}{R}.