When Renowned Roughrider enters or leaves the battlefield, create a 1/1 white Human creature token. Then if you control four or more creatures, put a +1/+1 counter on a creature you control.
Wander {4}{W}{W}

Fabric — When this creature enters, target creature gets +X/+X until end of turn, where X is the number of enchantments you control.

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. If you control another permanent you don't own, it gets +2/+0 until end of turn.

When Resourceful Hireling enters, choose one —
• Create a 0/0 colorless Robot artifact creature token with a +1/+1 counter on it.
• Create a Treasure token.

This spell has lifelink as long as you control a creature with lifelink.
Retaliatory Outburst deals 4 damage to target tapped creature.

Trample
Whenever Revolutionary Throng attacks, if you control another creature with power 4 or greater, it gets +2/+0 until end of turn.

Choose one —
• Exile target artifact or enchantment.
• Exile target creature you control, then return it to the battlefield under its owner's control. If that creature entering the battlefield causes any abilities to trigger, those abilities trigger an additional time.

Flying
When this creature enters, you may pay {3}{U}. If you do, create two 1/1 blue Bird creature tokens with flying.
Other creatures you control with flying get +1/+1.

Whenever Rogue Justiciar becomes the target of a spell or ability you control, you may tap target creature. This ability triggers only once each turn.

Level up {1}{B}
[level 1-2] When this creature dies, put its counters on another target creature you control with level up.
[level 3+] When this creature dies, put its counters on each creature you control with level up.

Lifelink
Landfall — Whenever a land you control enters, create a Berry token. You may attach it to Rooting Raccoon.

Choose any number of permanent cards in your graveyard put there from the battlefield this turn. Return one of them to the battlefield and the rest to your hand.
Cycling {W/B}

Deathtouch
{X}{U}: This creature gets +X/-X until end of turn.

Put a +1/+1 counter on target creature you control, then double the number of +1/+1 counters on it.

Whenever this Subroutine runs, search your library for a basic land card, put it onto the battlefield, then shuffle.

Saboteur's Immolation deals 2 damage to each creature.
Cycling {2}

{T}: Each player draws a card.
{1}, {T}: Each player draws two cards.
{2}, {T}: Each player draws three cards.

Whenever you attack, defending player loses 2 life and you gain 2 life.

Deathtouch
Landfall — Whenever a land you control enters, Sandstorm Dancer acclimates.

Reach
When Sandstorm Devil enters, it acclimates.
As long as you control a Weather or another Dragon, Sandstorm Devil has menace.

As an additional cost to cast this spell, exile X cards from your graveyard.
You draw X cards and gain X life, then each opponent loses X life.

Players can't gain life.
Whenever a player casts a spell, Scathing Remarks deals 1 damage to that player for each of that spell's colors.

Double target creature's power and toughness until end of turn.
Flashback {1}{G}

Whenever one or more creatures you control deal combat damage to a player, you may draw that many cards. If you do, discard a card.
Exile two creature cards from your graveyard: Scrapyard Mecha becomes an artifact creature until end of turn. Activate only as a sorcery.
Crew 2

Whenever a Subroutine you control enters, you may pay {2}. If you do, it runs.
Whenever a Subroutine you control runs, this creature gets +1/+1 until end of turn.