+Singe (12)
Haste
Whenever Akoum Battlesinger or another Ally enters the battlefield under your control, you may have Ally creatures you control get +1/+0 until end of turn.
: Cylian Sunsinger and each other creature with the same name as it get +3/+3 until end of turn.
Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)
When Kolaghan Stormsinger is turned face up, target creature gains haste until end of turn.
Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
You may choose not to untap Rubinia Soulsinger during your untap step.
: Gain control of target creature for as long as you control Rubinia and Rubinia remains tapped.
When you control no Islands, sacrifice Seasinger.
You may choose not to untap Seasinger during your untap step.
: Gain control of target creature whose controller controls an Island for as long as you control Seasinger and Seasinger remains tapped.
: Target creature an opponent controls attacks this turn if able.
, : Attacking creatures get -1/-1 until end of turn.
Singe deals 1 damage to target creature. That creature becomes black until end of turn.
When Singe-Mind Ogre enters the battlefield, target player reveals a card at random from their hand, then loses life equal to that card's mana value.
Flash
When Threnody Singer enters the battlefield, target creature an opponent controls gets -X/-0 until end of turn, where X is your devotion to blue. (Each in the mana costs of permanents you control counts toward your devotion to blue.)
Combat Inspiration — At the beginning of combat on your turn, target creature you control gets +1/+0 until end of turn.
Vigilance, trample
Whenever Venerable Warsinger deals combat damage to a player, you may return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of damage Venerable Warsinger dealt to that player.
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: Gain control of target creature whose controller controls an Island for as long as you control Seasinger and Seasinger remains tapped.