Moonsnare Prototype

{T}, Tap an untapped artifact or creature you control: Add {C}.
Channel — {4}{U}, Discard Moonsnare Prototype: The owner of target nonland permanent puts it on their choice of the top or bottom of their library.

Seat of the Synod

Island

Disruptive Pitmage

{T}: Counter target spell unless its controller pays {1}.
Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Hoodwink

Return target artifact, enchantment, or land to its owner's hand.

Vedalken Certarch

Metalcraft — {T}: Tap target artifact, creature, or land. Activate only if you control three or more artifacts.

Darksteel Citadel

Aether Adept

When Aether Adept enters, return target creature to its owner's hand.

Aven Fogbringer

Flying
When Aven Fogbringer enters, return target land to its owner's hand.

Churning Eddy

Return target creature and target land to their owners' hands.

Rhystic Study

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

Disruptive Student

{T}: Counter target spell unless its controller pays {1}.

Silverbluff Bridge

Silverbluff Bridge enters tapped.
Indestructible
{T}: Add {U} or {R}.