Lii's Violin

Whenever a creature becomes untapped, it gets
+1/+0 until end of turn.
{x}{r}, {t}: Discard a card with converted mana
cost X. If you do, gain control of target creature
with power X or less until end of turn. Untap
that creature. It gains haste until end of turn.
Activate this ability only any time you could
cast a sorcery.
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Lii, Vim-Filled Violinist
https://mtgcardsmith.com/view/lii-vim-filled-violinist