Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.

Ghostly Prison

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

{3}, Sacrifice this creature: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Enchant creature
Enchanted creature has "Whenever you gain life, put that many +1/+1 counters on this creature."

Equipped creature gets +1/+1 for each land you control.
Equip legendary creature {3}
Equip {7}