When these creatures that force sacrifice enter, it's best to sacrifice them as once the effect resolves they tend to not do anything on the battlefield, and are better in the graveyard for Squall to reanimate
But one card that's begun to look like it might - might - take things just a little far towards homogeneity in competitive decks, however, is Irida
cards to efficiently deploy high-power Characters, and leverage the powerful [Rush] effects of red and green cards to maintain relentless pressure, giving your opponent no chance to strike back
Oddly, it might be stronger as a maindeck tutor target anyway, especially when you take into consideration how powerful some of the bullets are
Because Vivis two abilities feed off one another with some help, its really easy to get into snowball situations that just end the game outright