Maelstrom Devastator

Multikicker {1}{g} (You may pay an additional {1}{g} any number of times as you cast this spell.)
Maelstrom Devastator has cascade for each time
it was kicked. (Multiple instances of cascade each
trigger separately.)
Maelstrom Devastator enters the battlefield with
a number of +1/+1 counters on it equal to X
plus the total mana value of all spells that
resolved before it this turn.