If youre playing any Songs while youre at it, Cinderella, Ballroom Sensation lets you exert Cinderella, so she counts for three when you cast your Song, which is a nice little bonus to your deck
Sacrifice after III.) I, II Search your library for a legendary creature card, reveal it, put it into your hand, then shuffle
If you can sacrifice two creatures, this card will make each opponent sacrifice a creature, lose 2 life and you will get 2 black mana and draw a card
Comet Storm + Crackle with Power + Jayas Immolating Inferno Big fireball that hits all opponents at once is a sub-category of its own
If youre playing a lot of cards that cost five or more mana, then having a high number of lands (36-40) would be a good idea
Although four mana is quite a lot, Omnath, Locus of Creation stabilizes games incredibly well and does a bit of everything