Bonescythe Sliver (Duels of the Planeswalkers Promos) [Duels of the Planeswalkers Promos 2013] XY121 Fusion Material Monsters that are

Fusion Material Monsters that are listed on a Fusion Monster Card that includes "Elemental Hero" in its card name

" —Ajani Goldmane

Set: Unlimited Edition Type: Creature — Elemental Rarity: Rare Cost: {2}{G}{G}{G}{G} Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking

Set: Diamond & Pearl: Stormfront Type: Psychic Rarity: Uncommon Retreat cost: Colorless

except "Thunder Dragon Titan" (in which case you do not use "Polymerization")

Bonescythe Sliver (Duels of the Planeswalkers Promos) [Duels of the Planeswalkers Promos 2013] XY121 Fusion Material Monsters that areSet: Duels of the Planeswalkers Promos 2013 Type: Creature Sliver Rarity: Rare Cost: {3}{W} Sliver creatures you control have double strike. (They deal both first strike and regular combat damage.) "Their appendages are sharper than our swords and quicker than our bows." Hastric, Thunian scout