Ideally, you boost Heartfire Hero with various pump effects, attack for 10, and sacrifice it for Burn Together to win the game
I must have been in battles with that guy a half-dozen times
Nyxbloom Ancient costs seven for a 5/5 with trample beater that will triple your mana
No, it does not cause two transforms, an additional trigger will find no card in the graveyard
You mill four so they are great with the Self-milling
White offers some really great Summon cards, with Summon: Knights of RoundSummon: Knights of Round creating a ton of token creatures over several turns, and the final chapter Ultimate End giving all your other creatures +2/+2 until the end of the turn, and giving then an indestructible counter