We have five neat combos you can bust out in your Commander decks that put the big Plant to good use
However, the effect counts only opponents (and not planeswalkers or battles) that you attacked with a creature when determining the bonus
It's noted that the one card shown with the Vanish ability also has the Illusion keyword, so some cards may trigger when an accompanying Illusion card is banished
It can't draw cards on its own, but it is happy to give other players cards as well
Sephiroth on the other hand plays into the usual control strategies favored by Blue/Black by growing in strength for every opposing creature you remove from play
Ideally, I would like to see something that isn't costing you card advantage, but, as far as movement enablers go, this is probably just good enough