Grade 4/Bermuda Triangle - Mermaid/15000+ Power/No Shield
Stride (Released when both players' vanguards are grade 3 or greater!)-Stride Step-[Choose one or more cards with the sum of their grades being 3 or greater from your hand, and discard them] Stride this card on your Vanguard Circle from face down.
Activate (Vanguard) [1/Turn]: [Choose a face down card named "PR♥ISM-Promise, Princess Labrador" from your G zone, and turn it face up] If you have a heart card with "PR♥ISM" in it's name, choose up to two of your rear-guards, and until end of turn, those units get + 5000 Power and "Auto (Rearguard): When this unit attacks or boosts, at the end of the battle, you may return this card to your hand.".