Regardless of Gyruda's companion ability, this is a highly impactful "enter the battlefield" ability that grows yet even more useful and consistent if a player is able to manipulate the top card of their library through effects such as scrying
I dont understand
'Legend' was originally just a creature type in these older cards, but in the future they would become essentially a supertype -- an extra adjective that tells you that this card falls under 'Legend rules', which means that only one copy of a card with the same name can exist on the board at any time (later changed to only one copy existing under the control of a player)
Thats some massive upside in heavy counters decks, and this is already a fairly aggressive survival creature on its own
Those experiences changed him, and theyve pushed Jace to become more mature, more responsible, and deeply committed to protecting others
You can make use of all this card draw with cards like Psychosis Crawler and Proft's Eidetic Memory to throw counters and damage around