Talabrina, The Blade Song

{u}{r} Talabrina gains haste and double-strike
until end of turn.
{r}{u}{u/r}{u/r} Copy instant or sorcery spell
you have cast this turn that targets a creature
or planeswalker an opponent controls,
you may choose new targets for that copy.
Anytime you cast a blue or red spell, add a +1/+1
counter to Talabrina.