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Yeah Chandra is easier to cast in a Big Red shell. The question is whether she's better at 6 mana than just playing Karn into Mycosynth Lattice, Sneak/Through the Breach into Emrakul, or going off...

Unless you plan on tapping 6 Mountain, not really. They Force one of the rituals (e.g. Desperate Ritual, Seething Song, LED, Manamorphose) to bottleneck you on mana and make you fizzle, in case your...

T1 -> 6 mana -> Burning Wish -> Empty the Warrens for 12-14 goblins.
T2 12 damage, 8
T3 dead

Of course if you have 7 mana you can just go
T1 -> Belcher -> 40 damage