There were a lot of factors: figuring out what people wanted out of a D&D set, how to fit that into competitive play environments, and how to capture the essence of everything on the cards
With next week's update, crafting any printing of Goreclaw, Terror of Qal Sisma will only require an uncommon wildcard, even if that printing is a rare

A Girl and Her Dogs (playtest) A Killer Among Us A Most Helpful Weaver Aang, Airbending Master Aatchik, Emerald Radian Abdel Adrian, Gorion's Ward Abian, Luvion Usurper (playtest) Abstruse Interference Abundant Countryside Abyssal Harvester Abzan Ascendancy Abzan Monument Academy Manufactor Accomplished Automaton Acererak the Archlich Aclazotz, Deepest Betrayal Acorn Catapult Adagia, Windswept Bastion Adanto, the First Fort Additive Evolution Adeline, Resplendent Cathar Adeline, Resplendent Cathar Adipose Offspring Adorned Crocodile Adorned Pouncer Advent of the Wurm Adverse Conditions Aerie Worshippers Aether Channeler Aether Chaser Aether Herder Aether Inspector Aether Poisoner Aether Refinery Aether Swooper Aeve, Progenitor Ooze Afterlife Afterlife Insurance Agate Instigator Agatha's Champion Age of Ultron Agent 13, Sharon Carter Agents of HYDRA Aggressive Biomancy Ainok Strike Leader Air Nomad Legacy Ajani Fells the Godsire Ajani Goldmane Ajani's Chosen Ajani's Last Stand Ajani, Nacatl Avenger Ajani, Nacatl Pariah Ajani, Outland Chaperone Ajani, Strength of the Pride Akim, the Soaring Wind Akki Ember-Keeper Akoum Stonewaker Akroan Crusader Akroan Horse Alandra, Sky Dreamer Alela, Artful Provocateur Alela, Cunning Conqueror Alenni, Brood Recruiter Alharu, Solemn Ritualist Alicia Masters, Skilled Sculptor Alien Invasion Aligned Heart Alirios, Enraptured Alistair, the Brigadier Alive // Well Alive // Well Allied Teamwork

Perhaps Im just having my own Old Man Yells at Cloud moment here, but it lends a sort of annoying inconsistency to your decks and the board state that might be funny at first glance but becomes rather grating over time
Ornery Tumblewagg is another in a long line of +1/+1 counter every turn cards like Luminarch Aspirant, Fight Rigging, and Siege Veteran