Ambiguous Robots: Most of the monsters are reptilian, combined with military hardware
This allows those nasty 'nids to enter the battlefield with X +1/+1 counters, with X being as much mana as you want to spend: spending five or more allows you to draw a card too
A block is preferable, since if he can take down a 3/3 and venture for you while trampling over for 4, youll feel pretty good about the situation
Thankfully, while Mystic Remora sees an insane amount of play, Wizards has given it a fair few reprints recently
Ainok Guide Ambush Krotiq Archers of Qarsi Ethereal Ambush Feral Krushok Formless Nurturing Frontier Mastodon Grim Contest Hunt the Weak Map the Wastes Return to the Earth Temur Runemark Whisperer of the Wilds
If a Pokmon card is already popular and in demand, an added misprint error can make it even more valuable