Kenji, Wandering Mage

Ward {2}
Spellbook - Whenever Kenji attacks, roll a d20.
1-9 | Creatures you control get +1/+0 until end
of turn.
10-19 | Creatures you control get +1/+0 and
gain trample until end of turn.
20 | Creatures you control get +2/+0 and gain
trample until end of turn.