The Great Pyroclasm

This card costs {1} less to cast for each Elemental creature in your graveyard.
Indestructible, trample, menace
When The Great Pyroclasm enters the battlefield,
each player sacrifices all non-Elemental creatures.
Sacrifice an Elemental: The Great Pyroclasm
gains +X/+Y, where is X is equal to half
that creature's power, and Y is equal to half its toughness. (Both are rounded up.)
"Yes! Raise hell, you demon! Burn it all down!"
- Brand