Since Ratadrabik has ward, you can keep him well protected while letting your other legendary creatures bite the bullet for him so they keep coming back for more
Drawing random cards from a shuffled deck makes gameplay balanced and less predictable and more exciting, but some cards with special abilities, like scry, can skirt the rules a little
Zekrom plays well with others, featuring multiple guests on its best cards from Black and White to the Sun & Moon era
One of the aforementioned cards was Juggernaut, which was reprinted in Tenth Edition and has since been in circulation with other sets
Broad applicability is quite limited, needing to meet the Modified requirement, but in decks that are pushing Auras, +1/+1 counters or Equipment, this last of the Kodama cycle could pack a punch
Maybe Hullbreaker Horror could do it, or a Sink Into Stupor, but there aren't a lot of things that could get it done