Celika, Accursed Witch

When Celika, Accursed Witch is in the Commander slot all Witch creatures gain
+1/+1
When Celika, Accursed Witch enters the battlefield you may pay {x}{r}, where {x} is the amount of Witch or Guardian creatures you control. give Celika, Accursed Witch trample and +{x}/+{x} until end of turn, then sacrifice Celika, Accursed Witch