Seeker, Devourer of Knowledge

Partner with Nemu, Devourer of Pies
Whenever Seeker, Devourer of Knowledge
attacks or blocks, investigate for each commander
you control.
{b}{b}{u}{u},{t}: Sacrifice {x}{x} food and/or clue
artifact tokens. You may cast an instant or
sorcery Spell from a graveyard with mana cost {x} or less without paying it's mana cost.
"You know what we should do after this?" -Seeker
"What?" -Nemu