Karn, Gilded Guardian

Vigilance, trample
When Karn enters, draw a card for each color among other artifacts you control.

Leviathan

Kiora of Salt and Sand

Whenever you attack, if you've activated a loyalty ability this turn, untap target attacking creature. It can't be blocked this turn.
Planeswalkers you control have "[−8]: Create an 8/8 blue Leviathan creature token with hexproof."

Mabel, Valley Hero

Whenever Mabel or another creature you control enters, put a +1/+1 counter on target creature that entered this turn.

Thopter

Saheeli, Jewel of Avishkar

Thopters you control have haste.
Whenever you cast a noncreature spell, create a 1/1 colorless Thopter artifact creature token with flying.

Tam, the Possibility

Planeswalker spells you cast cost {1} less to cast.
{W}{U}{B}{R}{G}, {T}: Proliferate X times, where X is the number of planeswalker types among planeswalkers you control. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)

Sculpture Treasure

Vraska, Soul of Stone

Artifact creatures you control have vigilance.
Whenever you cast a noncreature spell, create a 1/1 colorless Sculpture Treasure artifact creature token with "{T}, Sacrifice this token: Add one mana of any color."

Treasure

Vraska, the Cutting Glare

Deathtouch
When Vraska enters, if you control six or more lands, destroy target permanent an opponent controls. They create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Karn, Argent Defender

Artifacts and creatures entering the battlefield don't cause abilities to trigger.

Diviner of Victory

This creature enters prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)
Whenever you scry or surveil, this creature gets +1/+1 until end of turn.

Unwind History

Return target creature an opponent controls with mana value 3 or less to its owner's hand. Surveil 1.

Diviner of Victory // Unwind History

Traxos, Scourge Eternal

Trample
Traxos doesn't untap during your untap step.
Whenever you cast an artifact or creature spell, untap Traxos.

Reality Fracture