Relentless Busker can't block.
{VP}{VP}{VP}: Return Relentless Busker from your graveyard to the battlefield.

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}

Drop — Reptilian Raver enters with two +1/+1 counters on it if you didn't cast any creature spells during your last turn.

Vigilance
{2}{W}: Create a Berry token and attach it to Restless Sloth.

When Retrofit Paladin enters, tap up to two target creatures with power 3 or less.

Defender
As long as you control a creature with power 4 or greater, Revel Watchguard can attack as though it didn't have defender.

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.

Flash
Flying

When Rotroot Hauler enters, mill three cards, then you may put a permanent card in your graveyard on top of your library.

Vigilance
When Royal Templar enters, target creature gets +2/+0 and gains vigilance and indestructible until end of turn.
Cybersoul {3}{W}

Runway Mech enters with a +1/+1 counter on it.

Flash
When Sanctum of the Two Truths enters, draw two cards.
Spellcharge 4

When Scattering Swine deals combat damage to a player, you may return a permanent you control to its owner's hand. If you do, that player loses 3 life unless they discard a card that shares a type with the returned permanent.

Vigilance
When Seasoned Spymaster enters, teach target creature vigilance.

Solidarity
You may look at the top card of your library any time.
You may cast creature spells that have a creature type no creature you control does from the top of your library.

Vigilance
Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on Shepherd of Steel.
When Shepherd of Steel dies, put its counters on target creature you control.

Flash
Whenever you cast Siflir, Elder Pawn or another spell, if you paid an alternate or additional cost to cast it, draw a card.
Wander {3}{U}{U}

When Sillaman Ambassador enters, put a +1/+1 counter on each of up to three target creatures you control.
Basic landcycling {1}{W}

When Sinister Sampler enters, exile up to one target artifact and up to one target artifact card in a graveyard.
{2}{VP}{U}{B}, {T}: Create a token that's a copy of a card exiled with Sinister Sampler. Activate only as a sorcery.

When Skarni Patrol enters, if you control an Equipment, you draw a card and you lose 1 life.
Pay 2 life: The next equip ability you activate this turn costs {2} less to activate. Activate only once each turn.

Whenever you cast a green spell, choose up to X, where X is the number of green mana symbols in that spell's mana cost —
• Create a 1/1 white Human creature token.
• Put a +1/+1 counter on a creature you control.
• Put a trample counter, vigilance counter, or a reach counter on a creature you control.
• Untap target land.

Trample
Whenever another creature you control becomes the target of a spell you control, create a token that's a copy of that creature, except it has haste. Sacrifice that token at the beginning of the next end step.

Menace
Whenever your Champion attacks, you may discard a card. If you do, draw a card.

When Skophos Warden enters, you may exile target artifact or enchantment an opponent controls until Skophos Warden leaves the battlefield.

Flying
When Skylance Escort enters, put a vigilance counter on each creature you control.