Frost Dragon's Reveal

Tap two creatures an opponent controls. Those creatures don't untap during their controller's
next untap step. Draw two cards.
"To be honest with you, I'm from Lishenna's plane.
Those of the Portalcraft class have unique traits that
appear to affect them even as planeswalkers. I'm not
the only one stuck here either. Tetra, Mono, Aenea
and a fox called Sekka are trapped here as well."
- Filene to Lennier