At the time of writing, Skymarch Bloodletter and Lichs Caress are two solid commons that have incidental lifegain (among many other cards that gain life)
Creatures need to be really dangerous these days if they arent going to draw cards or disrupt the opponent, and Mossborn Hydra is an example of that kind of creature
notably, level 3 hits all opponents, and you only need to spend one treasure on a spell to get the full amount of damage from it
Unlike formats where one or two strategies might overwhelmingly dominate, Pioneer often sees a healthy balance of aggro, control, midrange, and combo decks, each presenting unique challenges and opportunities
The morph effect applies to the face-down object wherever it is, and it ends when the permanent is turned face up
And if you have ways to sacrifice creatures, Smaug gets even better, since otherwise your opponents can exile the token or bounce it