So while Council of the Soratami is a brilliant side of a card to have as a backup it is not a great reason to include as the main function which it invariably is due to five being so very much in the cube
Heavenly Inferno You might not enjoy how rife the format became with cards like Kaalia of the Vast or Karador, Ghost Chieftain, but you cannot deny their power
A 6/6 is pretty big but most decks can take it down with a simple double block
You would take half with Gisela out, so just a single damage per nonbasic land you are running, while your foes double, so essentially four damage per nonbasic land they control
The big downside here is the additional casting cost of returning a card from exile to an opponents graveyard
Icon of Ancestry, for example, has the same +1/+1 typal bonus as Vanquisher's Banner, but for three mana it allows you to search the top three cards of your library for a Goblin to put into your hand