While Dobermon's sacrifice gives Takato, Henry, Rika, and Ryo the ability to BioMerge with their partners in the real world, and become Gallantmon, MegaGargomon, Sakuyamon, and Justimon, it doesn't give them any protection against the D-Reaper, and its ability to delete anything it touches
We've spent hours playing this spin-off card game, taking on both solo battles and online duels to decide on the best cards from the current pool
This can destroy certain decks that need their mana for other things such as casting creatures, and can force them to budget their mana a lot more than they usually would while you just continue playing (assuming youre playing a deck that is big on mana, that is, otherwise this will greatly affect you too)
If a creature with a boast ability is put onto the battlefield attacking, it was never declared as an attacker
They are just simple ways to do simple things nice and cost effectively