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.

Overgrown Battlement

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

Wall of Tanglecord

Defender
{G}: Wall of Tanglecord gains reach until end of turn. (It can block creatures with flying.)

Mountain

Wrap in Vigor

Gruul Guildgate

This land enters tapped.
{T}: Add {R} or {G}.

Rolling Thunder

Rolling Thunder deals X damage divided as you choose among any number of targets.

Tinder Wall

Defender (This creature can't attack.)
Sacrifice Tinder Wall: Add {R}{R}.
{R}, Sacrifice Tinder Wall: It deals 2 damage to target creature it's blocking.

Simic Guildgate

This land enters tapped.
{T}: Add {G} or {U}.

Island

Axebane Guardian

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

Izzet Guildgate

Izzet Guildgate enters tapped.
{T}: Add {U} or {R}.

Forest

Train of Thought

Replicate {1}{U} (When you cast this spell, copy it for each time you paid its replicate cost.)
Draw a card.

Ulamog's Crusher

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)
Ulamog's Crusher attacks each combat if able.

Wall of Vines

Defender (This creature can't attack.)
Reach (This creature can block creatures with flying.)