Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Reliquary Tower

You have no maximum hand size.
{T}: Add {C}.

({T}: Add {W} or {U}.)
Prairie Stream enters tapped unless you control two or more basic lands.

Flying
Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

{T}: Each player may draw a card, then each player who drew a card this way gains 1 life.