Eightfold Maze

Cast this spell only during the declare attackers step and only if you've been attacked this step.
Destroy target attacking creature.

Warrior's Stand

Cast this spell only during the declare attackers step and only if you've been attacked this step.
Creatures you control get +2/+2 until end of turn.

Yuan Shao, the Indecisive

Horsemanship (This creature can't be blocked except by creatures with horsemanship.)
Each creature you control can't be blocked by more than one creature.

Fire Bowman

Sacrifice Fire Bowman: It deals 1 damage to any target. Activate only during your turn, before attackers are declared.

Blaze

Xun Yu, Wei Advisor

{T}: Target creature you control gets +2/+0 until end of turn. Activate only during your turn, before attackers are declared.

Lone Wolf

You may have Lone Wolf assign its combat damage as though it weren't blocked.

Rolling Earthquake

Rolling Earthquake deals X damage to each creature without horsemanship and each player.