This can be before blockers are declared, after blockers are declared but before combat damage is dealt, during combat after combat damage is dealt, during the postcombat main phase, during the end step, or, in some unusual cases, during the cleanup step
Most of the other cards want you to play them as the Commander of their very specific deck
They offer a really easy listing process and the fees are about on par with all other online outlets
The deck is a master of adaptation, able to play aggressively against control or defensively against aggro
Sapphire Coil can replace the work of some of the characters in the starter deck, so you can swap in better ones
As a result the formats axis rested on Stoneforge Mystic and Jace, the Mind Sculptor versus Primeval Titan, and we all know how that one ended