Cone Of Cold

Roll a D20. If you have no creatures, add 3 to the result. If you have completed three differently
named dungeons, you may reroll the result.
[1-7]:Tap one target creature. It doesn't untap its controller next untap step.
[8-14]:Tap two target creatures, they don't untap
their controllers next untap step.
[15-20]:Tap three target creatures, they don't
untap their controllers next untap step.