Ruff, Underdog Champ

Eldrazi you control are Slivers in addition to their other types. Slivers you control have devoid and annihilator 1. 3: Create a 1/1 colorless Eldrazi Sliver creature token. It has "Sacrifice this creature: Add C."

When Stack of Paperwork enters, draw a card. Combat damage uses the stack. (Combat damage assignment can be responded to before damage is dealt. You know, like it used to.)

Protection from enemy-colored multicolored (This creature can't be blocked, targeted, dealt damage, enchanted, or equipped by anything that's two enemy colors, such as blue and green.)

Destroy target artifact.

Underdark Beholder enters the battlefield with ten eyestalk counters on it. If Underdark Beholder would be dealt damage, remove that many eyestalk counters from it instead. If you can't, sacrifice it. Whenever Underdark Beholder attacks, reveal cards from the top of your library until you reveal an instant, sorcery, or enchantment card with converted mana cost less than the number of eyestalk counters on Underdark Beholder. You may cast it without paying its mana cost. Shuffle your library.

When Bone Rattler is put into your graveyard from anywhere, exile it. When you do, create four Reassembling Skeleton token cards and put them into your graveyard.

Target creature or player gains flying until end of turn. (Players with flying can't be dealt damage by creatures without flying.)

You may cast Throat Wolf during an opponent's combat phase. Firstest strike (This creature deals combat damage to creatures before creatures with first strike.) After each opponent's first combat phase of each turn, there is an additional combat phase. Only Throat Wolf can attack during that combat phase.