Colorstorm Stallion (Secrets of Strixhaven #299)

Creature — Elemental Horse - {1}{U}{R}
Ward {1}, haste
Opus — Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. If five or more mana was spent to cast that spell, create a token that's a copy of this creature.
3/3