Colorstorm Stallion (SOS 299)

Creature — Elemental Horse • Mana cost: {1}{U}{R} • Secrets of Strixhaven • Rare

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.

Illustrated by Eglė Mosakaitė.