Defender
When Herald of Awakening enters, draw a card. Then discard a card unless you control a Ruin.
Whenever a Ruin you control becomes spellcharged, Herald of Awakening loses defender until end of turn.

When Shaman of Rime's Fury enters, create a 0/0 colorless Spirit creature token. Put a number of +1/+1 counters on that token equal to the total number of instant and/or sorcery cards you own in exile and in your graveyard.

When Snowscryer enters, surveil 3.

Flying
Whenever you draw your second card each turn, tap target nonland permanent.

Flying, deathtouch

When Ambient Illuminator dies, if you've scried this turn, you gain 3 life and draw a card.

Deathtouch
If an opponent would lose life, they lose that much life plus 1 instead.
Spellcharge 3

Flying
Favored
Whenever your Champion attacks, you may double its power until end of turn. If you do, sacrifice it at the beginning of the next end step.

When Beckoner of Ends enters, target player discards a card. Integrate that card.
Beckoner of Ends has deathtouch as long as a land card is integrated onto it.

Flash
When Blightfang Zyxthax enters, discard a card. If you do, it gains deathtouch until end of turn.

{2}, Sacrifice another creature: Put a +1/+1 counter on Coward-Eater. Draw a card.

When Deathcap Guardian enters, exile any number of permanent cards from your graveyard. When you do, put X +1/+1 counters on Deathcap Guardian and up to one target creature gets -X/-X until end of turn, where X is the number of cards exiled this way.

Sacrifice another creature or Food: Downtrodden Butcher dares 4.

Decayed
{1}{B}, Exile Expendable Medic from your graveyard: Return target creature card from your graveyard to your hand. Activate only as a sorcery.

Lifelink
Pay the equip cost of an Equipment you control: Return Gutwrenched Martyr from your graveyard to the battlefield with a finality counter on it. Attach that Equipment to it. Activate only as a sorcery.

Deathtouch
Drop — When Malicious Mech enters, each player sacrifices a creature. If you didn't cast any creature spells during your last turn, instead each opponent sacrifices a creature.

Flying
Equipped creature gets +2/+0.
Equip {2}
Spellcharge 2

Whenever Skarni Raider attacks, if it's equipped, you draw a card and you lose 1 life.

Flying
Drop — When Soul Melter enters, if you didn't cast any creature spells during your last turn, each opponent loses 2 life and you gain 2 life.

Flying
Whenever Synthetic Specter deals combat damage to a player, that player discards a card. Then if they have no cards in hand, put a +1/+1 counter on Synthetic Specter.

As long as it's your turn, Ultraviolet Maniac has lifelink.
{VP}{VP}{VP}: Until end of turn, whenever you gain life, each opponent loses that much life.

Approval — When Warrant-Borne Cop enters, target player reveals X cards from their hand, where X is the number of colors among permanents you control. You choose one of them. That player discards that card.

Whenever you cast a spell that targets Anvilwrought Lion, creatures you control get +1/+0 until end of turn.

Trample
Whenever Arena Champion attacks, create a Weapon token, then attach it to an attacking creature you control.

Flying, haste
When Chainbreaker's Familiar enters, exile target instant or sorcery card from your graveyard. You may cast a copy of that card until the end of your next turn.
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, you may return Chainbreaker's Familiar from your graveyard to your hand.