Grel, Maelstorm's First

0: Discard a Planeswalker card: create two 3/3 elemental token with haste, sacrifice it at the next end step
-2: Exile Grel, Maelstorm's First and target permanent. Return both to the battlefield at the next end step
-X: Cascade for converted mana cost X, where X is the number of loyalty counters on Grel,Maelstorm's First. You lose life equal to the cards CMC