Choose a creature card with mana value 1 in your graveyard, then do the same for creature cards with mana value 2 and 3. Return those cards to the battlefield.
"Variety is also the spice of death."n—Cevraya, Golgari shaman
If you don't have a creature card in your graveyard with one mana value, you just continue on to the next.
05-10-2018
wotc
Gruesome Menagerie doesn't target the cards to return. You choose them while it's resolving. No players may take actions between the time you make each choice and the time you return them to the battlefield.
05-10-2018
wotc
All of the returned cards enter the battlefield at the same time.
05-10-2018
wotc
If a card in your graveyard has {X} in its mana cost, X is considered to be 0.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.