Its most dramatic use is sacrificing it to give your whole board +0/+5 and indestructible, ensuring your team survives removal and combat damage while tilting the battlefield heavily in your favor
Perhaps the most fun of these references is 'Heart of a Duelist', based on a common phrase from Yugioh
Long Answer Since this is the long answer, I'll have the time to properly run through these more important needs
Carnelian deals a huge 280 damage, more than enough to take down most threats, though it comes with the drawback of preventing Flareon from attacking the next turn
Orzhov Aggro This is a Sealed deck that I went 3-1 with in a Limited PPTQ
Not only can he call in other Astartes for assistance, with them (or with other tokens) comes important intel, as he's also a master tactician