Call from the Grave

To choose a random creature from a random graveyard, first choose a random graveyard with at least one creature card in it. Then choose a random creature card from that graveyard.

For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.

The choices of random creature and random graveyard are made as Call from the Grave resolves.