Like their metallic ink colour suggests, steel cards are built to be tough, with strength and willpower stats that are often higher than their counterparts in other ink colours
Some guessed that Etali's ability mirrored Act on ImpulseAct on Impulse, another guessed that the ability was like Grenzo, Havoc RaiserGrenzo, Havoc Raiser on an attack trigger, and then others were betting on the trigger being related to combat damage
Yes, "freezing" a character out for a turn is strong (it's safe to assume you will always have a target not at a location)
Lilianas Caress Liliana's Caress is an almost strictly better Megrim since it does the same and costs one less to cast
Ragavan allows midrange decks to take an aggressive stance, which has been tough for a number of years
It can also be incredibly expensive, which makes jumping into the format daunting