Arcane Signet

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

Command Tower

Noncreature spells with mana value 4 or greater can't be cast.
Noncreature spells with {X} in their mana costs can't be cast.

({T}: Add {G} or {W}.)
Canopy Vista enters tapped unless you control two or more basic lands.

Exile target creature. Its controller gains life equal to its power.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.