The target creature must attack the target opponent if able, not a planeswalker controlled by that player.
2014-11-07
wotc
If, as attackers are declared, the target creature is tapped, is affected by a spell or ability that says it can’t attack, or hasn’t been under its controller’s control continuously since their last turn began (and doesn’t have haste), then it doesn’t attack. If there’s a cost associated with having the creature attack the opponent, its controller isn’t forced to pay that cost, so it doesn’t have to attack that player in that case either.
2014-11-07
wotc
If the creature can’t attack the player for one of the above reasons but it can still attack elsewhere, its controller may choose to have it attack another player, attack a planeswalker, or not attack at all.
2014-11-07
wotc
If either the target creature or the target player is an illegal target when the activated ability tries to resolve, the ability will have no effect. The creature won’t be forced to attack that opponent, but it still can if able.
2014-11-07
wotc
“Target opponent” means one of your opponents. In other words, Dulcet Sirens’s ability can’t make a creature attack you.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Not Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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