Reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order. When you reveal a creature card this way, put X +1/+1 counters on target creature you control, where X is the mana value of that card.
Legalities
tlrlegal
duellegal
brawlnot legal
pennynot legal
PreDHnot legal
Rulings · 2
wotc
You don't choose a target for Yuna's Whistle at the time you cast it. Rather, a second "reflexive" ability triggers when you reveal a creature card this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
wotc
If the revealed card has {X} in its mana cost, X is 0 for the purpose of determining its mana value.
Notes
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