Qiyana, Elemental Empress

When Qiyana, Elemental Empress attacks,
add {u}{r}{g}. Only mana generated this way
can be spent to pay for the below abilities:
{2}{u}: Tap target creature an opponent controls.
Scry 1.
{2}{r}: Target creature gets +1/+1 and first strike
until end of turn.
{2}{g}: Qiyana, Elemental Empresss gains
trample and shroud until end of turn.