When Widowed Maiden enters, return target creature card from your graveyard to your hand.
Spellcharge 3

{2}, Sacrifice a creature: Teach target creature menace.

Trample
Whenever one or more creatures you control with trample deal combat damage to a player or planeswalker, put a +1/+1 counter on target creature you control.

This spell costs {1} less to cast for each instant and/or sorcery card in your graveyard.
When Heretic Hunters enters, you may discard your hand. If you do, draw a card and Heretic Hunters deals 2 damage to each opponent.

Approval — When Inflammatory Declaimer enters, it deals X damage to each opponent, where X is the number of colors among permanents you control.

Trample
Whenever Iron Steambreaker attacks, put a +1/+1 counter on it.

Whenever you amp it up, Spirit of the Crowd gets +1/+1 and gains trample until end of turn.

Once each turn, when an opponent is dealt damage, you may pay {R} and discard up to X cards, where X is equal to the damage dealt. If you do, draw that many cards. Put a +1/+1 counter on Strongarm Gambler.

Menace
When Wildcaster Ogre enters, exile an instant or sorcery card from your graveyard at random. You may cast a copy of that spell without paying its mana cost.

Whenever a creature you control becomes a Rebel, Zolo's Right Horn deals 2 damage to each opponent.
{3}{R}: Zolo's Right Horn dares 5.

When Beastbond Instructor enters, put a trample counter on target creature you control.

Bouncers-for-Hire can't attack unless you control a red permanent.

Deathtouch
Whenever a creature you control with deathtouch deals damage to a planeswalker, destroy that planeswalker.
{2}{G}, Exile Contagion Brewer from your graveyard: Return target creature card with deathtouch from your graveyard to your hand.

Flash
Vigilance
When Gato Troubador enters, untap each other creature you control. Other creatures you control with vigilance gain indestructible until end of turn.

When Reaching Remnant enters, it deals 4 damage to target creature with flying you don't control.
Spellcharge 3

Sleeper Insurgent doesn't untap during your untap step.
Whenever Sleeper Insurgent becomes the target of a spell or ability you control, untap it. This ability triggers only once each turn.

Flash
When Supporting Crowd enters, you may have another target creature you control dare 5.

Whenever Raksolcs Ravage-Soul deals combat damage to a player, create a Treasure token.
Whenever you sacrifice a permanent, Minotaurs you control get +2/+0 until end of turn. Creatures you control gain menace until end of turn. This ability triggers only once each turn.

As an additional cost to cast this spell, sacrifice a creature.
When Skophos Conqueror enters, draw a card. Skophos Conqueror deals 2 damage to each opponent.

Menace
When Speaker of Ash enters, you may sacrifice a nonland permanent or discard a card. If you do, each opponent sacrifices a nonland permanent with mana value equal to the sacrificed permanent or discarded card's mana value.

Flying, trample
When Blooming Cocollona enters, you may have it deal 3 damage to another target creature or planeswalker. If you do, that permanent's controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Flying
Ward—{2}, Pay 2 life.
Whenever you cast a noncreature spell, draw a card.

Other legendary creatures you control get +1/+1.
Whenever a legendary creature you control attacks, exile the top card of your library. You may play that card this turn.
Whenever you cast your fifth spell each turn, Juana deals 10 damage to any target.

Flash
When Hazakh Ambassador enters, target creature gains deathtouch until end of turn.
Basic landcycling {1}{B}

Flying, vigilance
Other creatures you control are Armies in addition to their other types.
At the beginning of your end step, create a 0/0 white Army creature token, then put a +1/+1 counter on each Army you control.