Welcome to one of the most debatable topics in the entirety of MTG
Wizards of the Coast has done this a few times, most notably with Search for Azcanta
This is so easy to do in MTG now - especially in red and just with Quintorius - that youll get a lot of use out of this card
Such fillers are apparently sometimes used in other TCGs (see The Collation Project on the topic of Magic: The Gathering) and are discarded after cutting (though I wouldnt be surprised if there are Jungle packs accidentally containing a blank card out there somewhere)
Humans have always been in Magic, so there are 30+ years of cards to draw from to assemble the best team

Advanced Search Sets Random Syntax "Lifetime" Pass Holder A Good Day to Pie A Trail of Teacups Abiding Grace Abuelo's Awakening Acolyte of Affliction Admiral Brass, Unsinkable Adun Oakenshield Aerie Ouphes Aerith, Last Ancient Afterburner Expert Aftermath Analyst Agadeem's Awakening Against All Odds Agyrem Aid the Fallen Ajani, Adversary of Tyrants Akoum Firebird Alesha, Who Laughs at Fate Alesha, Who Smiles at Death Along the Crooked Way Altar of Bhaal Altar of Bhaal Altar of the Wretched Anarchist Anathemancer Angel of Glory's Rise Angel of Indemnity Angelic Renewal Angrath, Minotaur Pirate Animate Dead Another Chance Anti-Venom, Horrifying Healer Antler Skulkin Aphetto Dredging Apprentice Necromancer Archaeomancer Archaeomender Archangel Elspeth Archenemy's Charm Archfiend of Sorrows Archon of Falling Stars Archpriest of Shadows Ardent Elementalist Artisan of Kozilek Ascend from Avernus Ascent of the Worthy Ashcoat of the Shadow Swarm Ashcoat of the Shadow Swarm Ashen Ghoul Ashnod's Harvester Aspect of Mongoose Astelli Reclaimer Atzal, Cave of Eternity Atzocan Seer Auramancer Auriok Survivors Aurora Eidolon Avengers Quinjet Awaken the Honored Dead Ayara, Furnace Queen Back for More Back for Seconds Back in Town Back on Track Badlands Revival Balduvian Atrocity Baloth Null Barrow Witches Barrowin of Clan Undurr Battle of Hoover Dam Behold the Sinister Six!
