Whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control
If an effect moves a melded permanent to a new zone and then affects that card," it affects both cards
So, Hades's mana value is 3 because Emet-Selch's mana cost is Adventures Adventures return in this set
I also have some issues with owyns art because her pose and movement look completely unnatural and I think it takes away from how genuinely cool her fight against the Fell Beast actually was (yes, Im absolutely nitpicking, dont mention it)
In Standard, I think this otter wizard will be viable in a future Izzet turns deck if WoTC hasnt learned and keeps printing those cards
Earlier this year, WotC even introduced cards that can transform into six different variants via the Specialize mechanic