Vrek, Exuberant Exhumer

When Vrek enters the battlefield, if [_____] was
spent to cast it, return [_____] with mana value 1
or less from [_____] to [_____].
================================= Stitch ===============================
• {w}, target permanent card, your graveyard, the battlefield.
• {u}, up to two target nonland permanents each,
the battlefield, their owners' hands.
• {b}, each creature card, your graveyard, your hand.
{bull} {r}, target instant card and/or target sorcery
card each, your g