2021-06-18 You are never forced to activate mana abilities to pay costs, so if there is a mandatory additional mana cost (such as from Thalia, Guardian of Thraben), you can decline to activate mana abilities to pay for it and hence fail to cast the suspended card, leaving it in exile
We only know of the siege subtype
When you do, this creature becomes a copy of another target creature you control, except it has this ability and "Whenever this creature deals combat damage to a player, you get that many ." Creature - Shapeshifter Blaster Hulk This spell costs less to cast for each (energy counter) you've paid or lost this turn
Drafna is a great commander to double up on all your important artifacts
It's also great in a fetchland format as it gives you a versatile mana dork that can swap to one that affects life totals
Divine Sacrament (Ext, Block) This threshold-enabled Crusade-variant graduated from madness-based Odyssey Block Constructed decks to nonmadness white weenie decks during the 2002 Extended season