Heart's Duality

Choose one —
• Untap target creature you control. It gets +2/-2
until end of turn. Spells that target it this turn
cost {1}{b} less to cast.
• Tap target creature you control. It gets -2/+2
and gains hexproof until end of turn.
"It's not an act! It's who I need to be. And this... this
is my escape! Where I can forget about it all! How
much I hate... everything."