Nils & Ninian, Ice Dragons

When Nils & Ninian, Ice Dragons attack or
block, choose up to two permanents controlled
by the attacking or defending opponent. Tap
those permanents and they don't untap during
their controller's next untap phase.
{s}{t} Flip Nils & Ninian, Ice Dragons.
"That's enough. I'm sorry. This is not your fault."
- Ninian