Légions

Provoke (Whenever this creature attacks, you may have target creature defending player controls untap and block it if able.)

When Merchant of Secrets enters the battlefield, draw a card.

{7}{G}: Stonewood Invoker gets +5/+5 until end of turn.

Covert Operative can't be blocked.

Morph {3}{B}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Skinthinner is turn...

First strike Provoke (Whenever this creature attacks, you may have target creature defending player controls untap and block it if able.)

Flying Cycling {2} ({2}, Discard this card: Draw a card.)

When Goblin Firebug leaves the battlefield, sacrifice a land.

Whenever Vile Deacon attacks, it gets +X/+X until end of turn, where X is the number of Clerics on the battlefield.

Flying

Cycling {3} ({3}, Discard this card: Draw a card.)

As long as you control a Beast, Skirk Outrider gets +2/+2 and has trample.

Morph {2}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Skirk Marauder is turn...

{T}: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

All Slivers have "{T}: Regenerate target Sliver."

{7}{R}: Flamewave Invoker deals 5 damage to target player or planeswalker.

Flying Morph {3}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

All Slivers have "{1}: This permanent becomes the creature type of your choice in addition to its other types until end of turn."

Flying {1}: Mistform Seaswift becomes the creature type of your choice until end of turn. Morph {1}{U} (You may cast this card face down as a 2/2 c...

{T}: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

Flash Any player may cast Sliver spells as though they had flash.

Morph {3}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Infernal Caretaker is...

{B}, Pay 1 life: Add one mana of any color.

Flash Any player may cast Sliver spells as though they had flash.