yugioh dogmatika cards CH01-EN014 Ecclesia, the Virtuous : Secret Rare 1st Edition Mint Card:: Unicorn also you cannot Special Summon from the Extra Deck for the rest of this turn White Knight of Dogmatika -

Megatron, Destructive Force attacks and you sacrifice your Spine of Ish Sah, obliterating your opponent's mana dork and dealing six excess damage to them on top of whatever other combat damage connects, and converting Megatron

It uses the stack and can be countered by effects that interact with triggered abilities, such as that of Nimble Obstructionist

2 Slifer The Sky Dragon's second artwork is the best of the set as well because it looks like the most threatening and powerful of the bunch, none of the others even come close to Slifer

As a way to just up your sacrifice potential this is poor

Its worth noting that Boros Charm protects more than just creatures