Opal Correah

Ward {x} — X is equal to the number of Spirit creatures you control.
Whenever you cast a noncolorless spell from your graveyard, create a 0/0 Spirit creature token
that's each of that spell's colors. It has "this
creature gets +1/+1 for each of its colors".
{t}: Add two mana in any combination of {g}, {w}, {u}, and/or {b}. Spend this mana only to cast noncolorless spells from your graveyard.