War-Wing SirenHow it works & interactions with other cards

How Heroic Works

The Heroic ability triggers whenever you cast a spell that targets War-Wing Siren. This ability goes on the stack on top of the spell that triggered it, meaning the +1/+1 counter is placed on the Siren before the original spell actually resolves. It is important to note that the ability only triggers when a spell is cast; copying a spell already on the stack or changing the targets of an existing spell will not cause the Heroic ability to trigger.

Resolution Step-by-Step

First, you announce a spell and choose War-Wing Siren as a target. Once you finish paying all costs, the Heroic ability triggers and is put on the stack. Both players have a chance to respond to the trigger; if no one does, War-Wing Siren receives a +1/+1 counter. Finally, the original spell resolves. If the original spell is countered or its targets become illegal before it resolves, War-Wing Siren still keeps the +1/+1 counter because the ability triggered the moment the spell was cast.

Common Pitfalls

A common mistake is thinking that targeting War-Wing Siren multiple times with the same spell (such as a spell that says 'choose any number of targets') will provide multiple counters. A Heroic ability triggers only once per spell, regardless of how many times that spell targets the creature. Additionally, remember that abilities of permanents already on the battlefield do not trigger Heroic; only 'spells' cast from your hand, graveyard, or exile will work.

When to Play War-Wing Siren

War-Wing Siren is most effective in decks featuring a high density of cheap instant or sorcery spells and Auras. Because it has Flying, it serves as a reliable 'voltron' piece that can fly over blockers once it has accumulated several +1/+1 counters. It is often best to hold a targeting spell in hand to protect it or grow it in response to an opponent's action.

Interaction examples

Doubling the Heroic Rewards

Roaming Throne

If you control Roaming Throne and chose 'Siren' or 'Soldier' as it entered, War-Wing Siren's Heroic ability will trigger twice whenever you cast a spell targeting it. You will put two +1/+1 counters on the Siren instead of one before your spell resolves.

Non-Targeting Interactions

Solemn Simulacrum

When Solemn Simulacrum enters the battlefield, you search for a land. This is an 'enters-the-battlefield' ability, not a spell targeting War-Wing Siren. Even if you cast Solemn Simulacrum, it does not target the Siren, so no Heroic trigger occurs.

Growth through Support

If you cast a spell like an Aura or a combat trick targeting War-Wing Siren, the Siren immediately gains a +1/+1 counter. This increase in toughness happens before the spell resolves, which can often save the Siren from damage-based removal spells that were cast in response.