Pitiless Horde [Dragons of Tarkir Prerelease Promos] RT2 face-up "Ice Barrier" monsters you

face-up "Ice Barrier" monsters you control cannot be destroyed by effects of Spell or Trap Cards

or 1 monster that mentions it

The lesson is clear

Set: Sun & Moon: Lost Thunder Type: Fairy Rarity: Secret Rare Retreat cost: Colorless

then send 1 of the Fusion Materials whose name is specifically listed on that card from your Deck to the Graveyard

Pitiless Horde [Dragons of Tarkir Prerelease Promos] RT2 face-up "Ice Barrier" monsters youSet: Dragons of Tarkir Prerelease Promos Type: Creature Orc Berserker Rarity: Rare Cost: {2}{B} At the beginning of your upkeep, you lose 2 life. Dash {2}{B}{B} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)