Recruiting yourself with Tribute Summon will lead to rank 5 immediately, and since it's WATER level 5, it's easy to get Xyz, which is difficult to do normally, such as Number 94: Crystalzeroor Super Cheap God
Jace Reawakened You can almost hear the MTG designers saying to each other: Let's be careful here and don't break anything, okay? and then slapping the Can't cast this before turn 4 on it
Mithril Coat is probably the best way to do this, since it functions as an instant speed protection spell that doesnt wear off
Scrapyard Recombiner Scrapyard Recombiner isnt quite as flexible as Arcbound Ravager when it comes to scrapping robots, but it makes up for that by searching your deck for any Construct creature and putting it into your hand when you activate its ability
The markets monster gains have also raised concerns about a potential bubble
Acornelia, Fashionable Filcher 3B Legendary Creature Squirrel 3/3 Whenever you cast a spell with a squirrel in its art, you get A (an acorn counter)