Feral Hydra [Shards of Alara] DP27 you can Special Summon them

you can Special Summon them all to the field

Set: Battle Pack 2: War of the Giants - Round 2 Card type: Effect Monster Rarity: Ultra Rare Attack: 0 Defense: 0 You can Tribute 1 monster

(Xyz Materials attached to it also become Xyz Materials on this card

You can only use this effect of "The Phantom Knights of Silent Boots" once per turn

you can change the Attribute of this monster

Feral Hydra [Shards of Alara] DP27 you can Special Summon themSet: Shards of Alara Type: Creature Hydra Beast Rarity: Rare Cost: {X}{G} Feral Hydra enters the battlefield with X +1 +1 counters on it. {3}: Put a +1 +1 counter on Feral Hydra. Any player may activate this ability. It shreds its prey as each head fights for the choicest bits.