Riel, Arcane Duelist

Whenever you cast an instant or sorcery spell, Riel, Arcane Duelist gets +X/+X until end of turn,
where X is that spell's mana value.

Whenever Riel, Arcane Duelist attacks for the first time each turn, untap Riel, Arcane Duelist, and after this combat phase there is an additional combat phase.


"I'm not the main character, I promise."