Rook, Renown Tinkerer

Ward {3}, First Strike

When Rook, Renown Tinkerer enters the battlefield
or attacks, roll a d20.
1 -10| Create a 1/1 colorless Thopter artifact creature
token with flying. It gains haste until end of turn.
11 -19| Create a 3/3 colorless Steel Protector artifact
creature token with menace.
20| Create both tokens, roll again.