Eredin Bréacc Glas

Creatures you control but don't own are Spirits in addition to their other types.
Whenever Eredin attacks, put a +1/+1 counter on it.

Raid — At the beginning of your end step, if you attacked this turn, exile the top X cards of target opponent's library where X is Eredin's Power.
Until the end of your next turn, you may cast spells from among those cards and mana of any type can be spent to cast those spells.