2nd anniversary one piece card game TCG Chinese Set (Chinese Exclusive) – Piece Character Cost Amazing New 2nd Anniversary Premium

While there are other reanimation spells like Animate Dead or Reanimate that may be more efficient in certain situations, Grim Return's flexibility to target any creature put into the graveyard that turn can make it a valuable addition to decks looking to capitalize on graveyard interactions

There is an official Tutorial App but theres also a better way to play OPTCGSim

Card Name Mana Cost Type Legendary Planeswalker Karn Rarity Mythic Rare rules Text +4: Target player exiles a card from their hand.3: Exile target permanent.14: Restart the game, leaving in exile all non-Aura permanent cards exiled with Karn

It's only on your second mulligan that the usual rules about returning cards to the deck apply