Crystal Sage of Farron

Magecraft — Whenever you cast or copy an instant
or sorcery spell, create a Shard token. (They're enchantments with "{2}, Sacrifice this enchantment:
Scry 1, then draw a card.")
{x}{u}{u}, Sacrifice X Shard tokens: Exile Crystal
Sage of Farron, then return it to the battlefield
under it's owner's control at the beginning of the
next end step. When it enters the battlefield this
way, create X 3/1 blue Illusion creature tokens.