Got a question regarding how power and toughness buffs work in this game for a card I've been considering for a deck. So I've got Coram on the field and Mightfrom Harmonizer. Currently I have a creature with power 5 in my grave so Coram's effect is giving him 5 power. I play my land for turn and using Mightfrom Harmonizer, I double Coram's power to 10. I attack with Coram. His effect triggers and I mill a creature with 7 power. What does Coram's power become? Would doubling his initial 5 power this way effectively be the same as giving him +5 boost till end of turn or is doubling power or toughness considered a different kind of buff? Would his power end up being 12? I'd think it would just be a +5 boost till end of turn and he'd end up with 12 but I ask since I know power set by effects can be a weirdly finicky thing rule wise in some card games and am unsure how it's done in this one exactly.