I think Festival of Embers is going to work best with spells that have multiple abilities and effects
Firkrag notably provides additional value for goading, as whenever a creature deals damage to one of your opponents, if it had to attack such as through a goading effect, you can put a +1/+1 counter on Firkrag, drawing a card in the process
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But even if there may be different sub-strategies, the key cards remain the same: cheap artifact creatures like Magitek Infantry to pile on early pressure, and powerful payoffs that take advantage of your flood of artifacts such as Valkyrie Aerial Unit
Use the creature's power as it last existed on the battlefield to determine how many +1/+1 counters to put on Vincent Valentine
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