Doctor Boom, Mad Genius

Dr Boom, Mad Genius enters the battlefield with a {s} counter on it. On your upkeep roll a die and remove a
{s} counter, you may use that ability this turn.
•[ 1 - 2 ] Blast Shield - gain Indestructible and Lifelink until end of turn.
•[ 3 - 4 ] Summon Microbots - Create three 1/1 Artifact tokens.
•[ 5 - 6 ] Zap Cannon - Deal 3 damage to target creature, that creature doesn't untap on their owners untap step.
When this card becomes untapped
it g