This creature gets +1/+1 for each card with a cycling ability in your graveyard.
Cycling {2}

When this creature dies, it deals 2 damage to each opponent and you gain 2 life.
{6}{B}, Exile this card from your graveyard: It deals 3 damage to each opponent and you gain 3 life.

Once each turn, when one or more cards leave your graveyard, you may have each opponent lose 1 life and you gain 1 life.
{2}{B}, Exile Writheling from your graveyard: Exile target card in a graveyard. You draw a card and you lose 1 life. Activate only as a sorcery.

Haste
Arid Outrider gets +1/+0 as long as you control a token.

Haste
{T}, Discard a card: Put a +1/+1 counter on another target creature you control and untap it. It gains haste until end of turn. Activate only as a sorcery.

Haste
Whenever you cast a spell that targets Efimia of the Horse, create a 1/1 white Human creature token if this is the first time this ability has resolved this turn. If it's the second time, creatures you control get +1/+0 and gain haste until end of turn. If it's the third time, creatures you control gain menace until end of turn.

When Eidolon of Empty Thoughts dies, create a Treasure token.
{6}: Create a 2/1 red Soldier creature token. Activate only as a sorcery and only if your devotion to red is three or more.

Favored

Damned — Whenever this creature attacks, put a +1/+1 counter on it if you've sacrificed a permanent this turn.
When this creature dies, it deals damage equal to its power to each opponent.

Whenever you cast an instant or sorcery spell, Ironcliff Blaster gets +1/+1 and gains first strike until end of turn.

{X}{R}: Jorgen gets +X/+0 until end of turn.
When Jorgen leaves the battlefield, he deals damage equal to his power to target opponent or planeswalker.
Wander {1}{R}

Menace, haste
Whenever you discard one or more cards, you may sacrifice this creature. If you do, return one of the discarded cards from your graveyard to your hand.

Pay 1 life: This creature gets +1/+0 until end of turn. Activate only once each turn and only as a sorcery.
When this creature dies, if its power was 2 or greater, create a Treasure token.

When Pensive Caldera enters, you may discard a card. If you do, draw a card.
{T}: Add {R}. Spend this mana only to cast artifact, instant, or sorcery spells.

Solidarity
{1}{R}: Choose a creature type. Ragecloak Shifter gets +2/+0 and becomes that type in addition to its other types until end of turn.

Menace
Creatures you control get +1/+0 if you've cast a spell that targeted Rathomar Forerunner this turn.

Menace
Corrupt — When this creature enters, if you control a permanent with greater mana value, exile the top card of your library. You may play it on any turn a creature you control dealt damage to a player.

When Revved Robo enters, you may put a +1/+1 counter on it. If you don't, it gets +2/+0 and gains haste until end of turn.

Whenever a Ruin you control becomes spellcharged, put a +1/+1 counter on Speaker of the Forebears.
Sacrifice Speaker of the Forebears: Add an amount of {R} equal to the number of +1/+1 counters on it.

Menace
Solidarity

Aethersteel Pouncer enters with a haste counter on it.

Trample
Whenever Aspiring Anarchist attacks, you may have its base power and toughness become equal to the power and toughness of another target attacking creature until end of turn.

When Dryad of the Keen-Eyed enters, search your library for a basic Forest card, reveal it, and put it into your hand. If your devotion to green is three or greater, put it onto the battlefield tapped instead.

Deathtouch
{1}{W}, {T}: Create a Berry token.
{2}{B}, Sacrifice a Berry: Put a +1/+1 counter on Foraging Grub.

{T}: Add one mana of any color. If you have at least 3 life more than your starting life total, add two mana in any combination of colors instead.