Each creature cast felt like I was propelling the game forward, rather than stalling it
Hence, you could activate the ability of Wall of Roots in between turns, and as it wasn't during a turn, you could activate it as many times as you wanted

Abstruse Archaic Adric, Mathematical Genius Ayesha Tanaka Azorius Guildmage Battlemage's Bracers Bind Bind (playtest) Biomancer's Familiar Brokers Confluence Brown Ouphe Burning-Tree Shaman Ceaseless Searblades Defabricate Deny the Witch Detention Vortex Disallow Dragon Whelp Drought Echo, Perceptive Prodigy Edifice of Authority Elvish Refueler Emerald Dragon Emerald Dragon Ertai Resurrected Farrelite Priest Gogo, Master of Mimicry Green Slime Heartstone Ice Cage Illusionist's Bracers Initiates of the Ebon Hand Interdict Kang the Conqueror Katabatic Winds Laboratory Drudge Linvala, Shield of Sea Gate Lithoform Engine Locus of Enlightenment Lost in Thought Louisoix's Sacrifice Lukka, Bound to Ruin Magewright's Stone Nalathni Dragon Nimble Obstructionist Oddric, Lunar Marquis (playtest) Orb of Origin (playtest) Ouphe Vandals Overcharged Amalgam Peter Parker's Camera Phenomena Recorder Power Artifact Primal Beyond Professor Hojo Quagnoth Ravager Wurm Repudiate // Replicate Repudiate // Replicate Reroute Return the Favor Rimewind Cryomancer Rings of Brighthearth Rust Scientist Supreme of A.I.M

Do Treasure Tokens Enter the Battlefield
Basically, you have to give up a little something to gain the card advantage and / or flexibility of the mechanic