weiss booster box Schwarz Overlord Premium and Michiru Weiss Schwarz: Azur Lane Vol.2

The colour changing from purple to green halfway down the neck, plus the weird blue spiritual aura around it, plus the generally weird pose and the random cow-tails

Threatening Roar is particularly effective when your opponent has limited means of bypassing your monsters without attacking, but Frogs excel at utilizing Caius the Shadow Monarch, Raiza the Storm Monarch, and Dark Dust Spirit, which can diminish the effectiveness of Threatening Roar

Corners must be well rounded

Note: This card is probably just Desperado, but considering Never Endorphin, it wouldnt be too shocking to suspect it might be a Des/Death pun.