Che-kai's assistant

At the beginning of your upkeep, create a
0/1 virus token.
At the beginning of your endstep, create a
0/1 robot token.
{u/b}{u/b}{u/b}{u/b}: Sacrifice Che-kai's assistant; counter target spell.
"There is no better assistant than one who truly understands your plans."
-Che-kai