Overgrown Battlement

Defender
{T}: Add {G} for each creature you control with defender.

Tree of Redemption

Defender
{T}: Exchange your life total with this creature's toughness.

Axebane Guardian

Defender
{T}: Add X mana in any combination of colors, where X is the number of creatures you control with defender.

Felothar the Steadfast

Each creature you control assigns combat damage equal to its toughness rather than its power.
Creatures you control can attack as though they didn't have defender.
{3}, {T}, Sacrifice another creature: Draw cards equal to the sacrificed creature's toughness, then discard cards equal to its power.

Crashing Drawbridge

Defender
{T}: Creatures you control gain haste until end of turn.