Rachel, Solemn Stitchwraith

Partner with Zack, Deranged Scythemaster
{2}{p/w}{p/w}{t}: Return two creatures with scythe
tokens from the graveyard to the battlefield.
Place one on top of the other. The creature on
top gets +X/+Y, where X is the creature on
bottom's power and Y is the creature on
bottom's toughness. They are one creature. That creature can use the activated abilities of either creature it is made of.