msem-instigator

Whenever Deluge Crab perseveres, target opponent mills three cards. (A creature perseveres when it survives damage.)

Flying

Vigilance, reach
Identity — As long as you control at least two other creatures that share a creature type with Gallord of the Order, other creatures you control get +1/+1 and have first strike.

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

Enchant creature
When Synergistic Curiosity enters, create a 2/2 blue Rogue creature token.
Enchanted creature gets +1/+1 and can't be blocked by creatures with flying.

Flying
Assault {2}{B} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Wretched Lammasu assaults, each opponent discards a card.

Whenever a nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of it except it is an enchantment. (It still has its abilities, but it's not a creature or other types.)

Equipped creature gets +2/+0.
Equipped creature has first strike as long as it's attacking.
Equip {3}

Whenever a player casts an instant or sorcery spell, Wiedfree Roughrider deals 2 damage to that player.
Whenever Wiedfree Roughrider attacks, you may pay {X}. When you do, destroy target noncreature, nonland permanent with mana value X.

Destroy each artifact with mana value X or less, then create an Idol token for each artifact destroyed this way. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Bleed {2}{R} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Target player loses 2 life. If this spell's bleed cost was paid, it deals 1 damage to each creature that player controls.

This spell costs {1} less to cast for each card type among cards in your graveyard.
Trample

Whenever a creature you control enters for the second time each turn, it gains haste until end of turn. You may have it get +1/+1 until end of turn.

When Brawlhost Escapee dies, create a Function token with “Target creature you control fights target creature you don't control.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Creatures your opponents control attack each turn if able.
Blocking creatures you control get +4/+0.
{W}: Untap Masha, Hero of Pelastrov.

Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
Chaosphere Ravager attacks each combat if able.

Prowess
Gilded Gunman gets +1/+1 as long as you control an artifact.

When Presence of the Unknown enters, you may sacrifice a creature. When you do, exile target nonland permanent.
Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.

When Garish Gillian enters, tap target land an opponent controls. That land doesn't untap during its controller's next untap step.
Unveil {3}{U}{R} ({3}{U}{R}: Transform this. Unveil only as a sorcery.)

Return all creature and planeswalker cards from your graveyard to the battlefield.

Flying, deathtouch

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)

Whenever another legendary creature you control enters, put a +1/+1 counter on The Lost and Seeking.
Surpass {4}{R}{W} ({4}{R}{W}: Transform this creature. This costs {1} less to activate for each counter on it. Activate only as a sorcery.)

When Chroma's Guidance enters, create a 2/2 green Wolf creature token.
Whenever you create a creature token, put a +1/+1 counter on it.

Haste
Glorious end — When Battle-Blind Leonin dies, if it was tapped, you may pay {B}. If you do, you draw a card and you lose 1 life.