After Unnatural Selection was printed, and the tribal emphasis and trickery in Onslaught Block, cards like Peer Pressure were adopted by Johnnies everywhere
Tromell, Seymours Butler Tromell, Seymour's Butler is an interesting +1/+1 counter card, being able to add counters and proliferate them
Climbers Kicking off with a card from the (at the time of writing) current set, Avatar: The Last Airbender, Badgermole Cub was always destined for big things
Morph was created by the rules team as they were figuring out how to make two Alpha cards, Onslaught and felt the mechanic played nicely with the typal theme
Heres a quick print-ready export checklist that covers most issues: Correct size: Export at standard card size (63mm x 88mm)
Plus theres lots of good tempo/control cards in merfolk builds that can help you disrupt the game until you can start to overwhelm