Foundations Jumpstart

Treasure

Legendary Creature — Human Rogue

Whenever you attack, target creature gains deathtouch until end of turn.
Whenever one or more creatures you control deal combat damage to a player, create a Treasure token, then look at the top card of that player's library and exile it face down. You may cast that card for as long as it remains exiled. (A Treasure token is an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Rev, Tithe Extractor

Dragon

Legendary Creature — Dragon

Flying
Whenever another nontoken Dragon you control enters, create a 5/5 red Dragon creature token with flying.
{1}{R}: Dragons you control get +1/+0 until end of turn.

Lathliss, Dragon Queen

Ravnica Remastered

Creature — Dragon

Flying
Whenever a Dragon you control attacks, create a 6/6 red Dragon creature token with flying.

Utvara Hellkite

Jumpstart 2022

Creature — Dragon Wizard

Flying
Whenever this creature deals combat damage to a player, each player discards their hand, then draws seven cards.

Dragon Mage

Kamigawa: Neon Dynasty

Creature — Snake Ninja

Ninjutsu {1}{G} ({1}{G}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, put a +1/+1 counter on target creature you control that doesn't have a +1/+1 counter on it.

Coiling Stalker

Planeswalker Championship Promos

Legendary Creature — Human Scout

Haste (This creature can attack and {T} as soon as it comes under your control.)
Whenever Ruby attacks while you control a creature with power 4 or greater, Ruby gets +2/+2 until end of turn.
{T}: Add {R} or {G}.