Promethean Princess, Bestower of Flames Link 3 FIRE Fiend 2+ Effect Monsters You cannot Special Summon monsters, except FIRE monsters. You can only use each of the following effects of "Promethean Princess, Bestower of Flames" once per turn. During your Main Phase: You can Special Summon 1 FIRE monster from your GY. If a monster(s) is Special Summoned to your opponent's field, while this card is in your GY (except during the Damage Step): You can target 1 FIRE monster you control and 1 monster your opponent controls; destroy them, and if you do, Special Summon this card. ATK 2700 |
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Quite the amazing card, to be honest. It's both an extender, and an endboard interruption once she's in the GY.
Quite often you will use her effect to revive a monster in order to Link Summon Amphibious Swarmship Amblowhale more easily, as the final step in your combos.
Then, during your opponent's turn, when they Special Summon, you will use her other effect to target Amblowhale and one of their monsters in order to destroy both and revive Princess. This will trigger Amblowhale's effect, and ideally a Sacred Fire King Garunix in your GY.
Just keep in mind she locks you into Special Summoning FIRE monsters only. If you have an I:P Masquerena in your GY waiting to be revived by Amblowhale, you will need to use a different method to destroy Amblowhale (things like either one of Fire King High Avatar Kirin's effects, or an Fire King Avatar Arvata negate), otherwise you will not be able to revive Masquerena.
We consider this a mandatory card - run 1 copy if you own her.