Gravity elementals deal with mass and size; their ability to accelerate objects makes them formidable enemies. Gravity elementals have skills like "momentum", that will make a gravity creature unstoppable and "gravity pull" that will waste the enemy attacks on a resistant or unessential creature.
Chimera: Combine all your creatures in a single one. Gravity pull (The damage inflicted to you is redirected to chimera)
Chimera has attack/life points equal to the total attack/life points of all your creatures currently in play. If one of the combining creatures has alfatoxin, the chimera will end up being a 1/1 malignant cell with momentum.