Yukaelin Arnys, Adjudicator

Skulk, Partner, Flash
{x}{w}{u}{b}: Name a card with mana value no
greater than X plus the last commander tax you
paid. Tap or untap target named card. Scry X.
Sacrifice a commander: Exile target named card
in any zone. You may put it in its owner's hand.
Sacrifice a permanent: Return target named card
in any zone that has an equal or lesser mana value
to it's owner's hand.