Tower Defense

Creatures you control get +0/+5 and gain reach until end of turn.

Crossbow Infantry

{T}: Crossbow Infantry deals 1 damage to target attacking or blocking creature.

Elite Archers

{T}: Elite Archers deals 3 damage to target attacking or blocking creature.

Caltrops

Whenever a creature attacks, Caltrops deals 1 damage to it.

Solid Footing

Flash
Enchant creature
Enchanted creature gets +1/+1.
As long as enchanted creature has vigilance, it assigns combat damage equal to its toughness rather than its power.

Towering Gibbon

Reach
Towering Gibbon's power is equal to the greatest mana value among creatures you control.