When Ukina enters, create a 1/1 blue Bird creature token with flying.
Flow — {5}{W/U}: Look at the top two cards of your library. Put one into your hand and the other on the bottom of your library.

{T}: Add {R} or {G}. When this mana is spent to cast a Dragon creature spell, Ukshu Dragonrider deals 1 damage to each opponent.

Inspired — Whenever Ukshu Sellsword becomes untapped, it gets +1/+0 until end of turn.
{2}{W}: Ukshu Sellsword gains first strike until end of turn.

Whenever an enchantment you control is put into your graveyard from the battlefield, each opponent loses 1 life and you gain 1 life.

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.

Whenever Unassuming Hooptie becomes a creature, attach any number of Equipment you control to it.
Unassuming Hooptie gets +1/+1 for each Equipment attached to it.
Crew 1

Target player reveals their hand. You choose a nonland card from it. That player discards that card.
Escape—{2}{B}, Exile five other cards from your graveyard.

Uncanny Woodghast has all activated abilities of all lands you control.

Revered
Trample
Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature.

As long as Undeniable Groove has power 4 or greater, it must be blocked if able.

Return target nonland permanent an opponent controls to its owner's hand. You may draw a card. If you do, discard a card.

Defender
As long as there is a -1/-1 counter on a creature, Undying Warden can attack as though it didn't have defender.

Each opponent sacrifices a creature.
Invoke {5}{B}

Level up {3}{R}
[level 1-2] Sacrifice an artifact or enchantment: This creature gets +1/+1 until end of turn.
[level 3+] Sacrifice an artifact or enchantment: This creature gets +2/+2 until end of turn.

First strike, haste
Whenever a player pays an alternate cost, Unrivaled Slayer deals 3 damage to that player.

Untap any number of target creatures. They gain flying and protection from noncreatures until end of turn.

Golems you control without ward have ward {1}.
Unspeaking Titan can't attack or block unless you control three or more Golems.
Whenever Unspeaking Titan enters or attacks, tap up to one target creature and put a stun counter on it.
{3}, {T}: Create a 1/1 white Golem creature token.

Target player sacrifices a creature or planeswalker. You may put a deathtouch counter on up to one target creature you control, then that player loses 1 life for each creature you control with deathtouch.

Approval — {3}, {T}, Discard a card: Draw a card. This ability costs {X} less to activate, where X is the number of colors among permanents you control.

Whenever you gain control of a permanent you don't own or a permanent you don't own enters under your control, put a +1/+1 counter on Vagrant Sorceress.

Once each turn, when a creature you control attacks alone, you may untap target attacking creature, and after this combat, there's an additional combat step.

Menace
Solidarity

Flying
Whenever you draw your second card each turn, create a 1/1 white Spirit creature token with flying.

Spellcharge 2
When Vanquished Conqueror dies, draw a card.