Considering the wording. I should be able to tap the creature due to the Aura's "Tap: Untap enchanted creature" ability, target the creature itself, which would force it to untap and resolve the Siren's ability?
Also, if a player doesn't have any cards in their hand, would I still be able to just abuse the ability to mill their entire library?
Trying to find some good cheese combos for a EDH mill deck =P.
Second Wind doesn't grant the enchanted creature an ability it is actually an ability of the Aura itself to tap in order to either tap or untap the enchanted creature. It is a very weird card, but it will not allow you to combo as you would need a way to untap the Second Wind itself.
Second Wind is a stupid and confusing aura (ah, Future Sight). You'll note that it does not say "enchanted creature gains 'Tap: Untap enchanted Creature'", but merely "Tap: Untap Enchanted Creature". For some reason, you're meant to tap the aura itself to tap or untap the enchanted creature. Thus, you can't go infinite; the best you can do is get one extra tap or untap per turn, which isn't great.
That said, if you do find a way to infinitely tap/untap Siren (say, Freed from the Real plus infinite blue mana), then that would indeed mill all of your opponents' libraries, regardless of how many cards they have in hand.
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Rollback Post to RevisionRollBack
"It is better for all the world if, instead of waiting to execute degenerate offspring for crime or to let them starve for their imbecility, society can prevent those who are manifestly unfit from continuing their kind. The principle that sustains compulsory vaccination is broad enough to cover cutting the Fallopian tubes... Three generations of imbeciles are enough."
--Buck v Bell, 1927. This case, regarding the compulsory sterilization of inmates at mental institutions, has -- somehow -- never been overturned. Just a wee PSA for ya.
To answer the unanswered part of the question, each of your opponents with no cards in hand just mills when the inspired ability is triggered. If an effect has no targets you always just do as much of it as possible. The only thing thst causes abilities to be countered that isn't a spell or ability (or a cost) is its targets becoming illegal.
Considering the wording. I should be able to tap the creature due to the Aura's "Tap: Untap enchanted creature" ability, target the creature itself, which would force it to untap and resolve the Siren's ability?
Also, if a player doesn't have any cards in their hand, would I still be able to just abuse the ability to mill their entire library?
Trying to find some good cheese combos for a EDH mill deck =P.
That said, if you do find a way to infinitely tap/untap Siren (say, Freed from the Real plus infinite blue mana), then that would indeed mill all of your opponents' libraries, regardless of how many cards they have in hand.
--Buck v Bell, 1927. This case, regarding the compulsory sterilization of inmates at mental institutions, has -- somehow -- never been overturned. Just a wee PSA for ya.
I̟̥͍̠ͅn̩͉̣͍̬͚ͅ ̬̬͖t̯̹̞̺͖͓̯̤h̘͍̬e͙̯͈̖̼̮ ̭̬f̺̲̲̪i͙͉̟̩̰r̪̝͚͈̝̥͍̝̲s̼̻͇̘̳͔ͅt̲̺̳̗̜̪̙ ̳̺̥̻͚̗ͅm̜̜̟̰͈͓͎͇o̝̖̮̝͇m̯̻̞̼̫̗͓̤e̩̯̬̮̩n͎̱̪̲̹͖t͇̖s̰̮ͅ,̤̲͙̻̭̻̯̹̰ ̖t̫̙̺̯͖͚̯ͅh͙̯̦̳̗̰̟e͖̪͉̼̯ ̪͕g̞̣͔a̗̦t̬̬͓͙̫̖̭̻e̩̻̯ ̜̖̦̖̤̭͙̬t̞̹̥̪͎͉ͅo͕͚͍͇̲͇͓̺ ̭̬͙͈̣̻t͈͍͙͓̫̖͙̩h̪̬̖̙e̗͈ ̗̬̟̞̺̤͉̯ͅa̦̯͚̙̜̮f͉͙̲̣̞̼t̪̤̞̣͚e̲͉̳̥r͇̪̙͚͓l̥̞̞͎̹̯̹ͅi͓̬f̮̥̬̞͈ͅe͎ ̟̩̤̳̠̯̩̯o̮̘̲p̟͚̣̞͉͓e͍̩̣n͔̼͕͚̜e̬̱d̼̘͎̖̹͍̮̠,͖̺̭̱̮ ̣̲͖̬̪̭̥a̪͚n̟̲̝̤̤̞̗d̘̱̗͇̮͕̳͕͔ ͖̞͉͎t̹̙͎h̰̱͉̗e̪̞̱̝̹̩ͅ ̠̱̩̭̦p̯̙e͓o̳͚̰̯̺̱̰͔̘p̬͎̱̣̼̩͇l̗̟̖͚̠e̱͉͔̱̦̬̟̙ ̖͚̪͔̼̦w̺̖̤̱e͖̗̻̦͓̖̘̜r̭̥e͔̹̫̱͕̦̰͕ ̗͔̠p̠̗͍͍̱̳̠r̰͔͎̰o͉̥͓̰͚̥s̟͚̹̱͔̣t͉̙̳̖͖̪̮r̥̘̥͙̹a͉̟̫̟̳̠̟̭t͈̜̰͈͎e̞̣̭̲̬ ͚̗̯̟͙i͍͖̰̘̦͖͉ṇ̮̻̯̦̲̩͍ ̦̮͚̫̤t͉͖̫͕ͅͅh͙̮̻̘̣̮̼e͕̺ ͙l͕̠͎̰̥i̲͓͉̲g̫̳̟͈͇̖h̠̦̖t͓̯͎̗ ̳̪̘̟̙̩̦o̫̲f̙͔̰̙̠ ̹̪̗͇̯t͖̼̼͉͖̬h̹͇̩e͚̖̺̤͉̹͕̪ ͚͓̭̝̺G͎̗̯̩o̫̯̮̟̮̳̘d̜̲͙̠-̩̳̯̲̗̜P̹̘̥͉̝h͍͈̗̖̝ͅa͍̗̮̼̗r̜̖͇̙̺a̭̺͔̞̳͈o̪̣͓̯̬͙̯̰̗h̖̦͈̥̯͔.͇̣̙̝