Vent Sentinel

Defender
{1}{R}, {T}: Vent Sentinel deals damage to target player or planeswalker equal to the number of creatures you control with defender.

Axebane Guardian

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

Defender
{T}, Tap an untapped creature you control: Add one mana of any color.

Defender
{2}{U}, {T}: Target player mills X cards, where X is the number of creatures you control with defender.

Defender (This creature can't attack.)
{T}: Add {G}.