Dragonslayer Armour

Convoke (Each creature you tap while casting this
spell pays for {1})
Trample
Shield Bash - {2}{t}: You may have Dragonslayer Armour fight target creature you don't control
Lightning Strike-{4}: Dragonslayer Armour deals
3 damage to target creature. Activate this ability
only as a sorcery, and once each turn.