Im interested
The level up keyword may not be around anymore, but the theme has continued with cards like Ascendant Spirit, Warden of the First Tree, Evolved Sleeper, and Surge Engine
Eat a removal spell and it'll just have a brief stint as Temple of Power before it transforms back

Path to Redemption Tale of Momo Glider Staff Thriving Heath 6 Plains [2t8d3N5Gn1ecBNsDqjQuJe] 1 Plains Appa [6rlws0Y9bsjCxQpb7zzpYk] 0007_MTGTLA_JSTheme: Insurgent Jumpstart Theme Card Momo, Rambunctious Rascal Inspired Insurgent Jeong Jeong's Deserters Invasion Reinforcements Glider Kids Kyoshi Warriors Aang, the Last Airbender Appa, Loyal Sky Bison Razor Rings Stand United Airbender's Reversal Tale of Momo Thriving Heath 6 Plains [2t8d3N5Gn1ecBNsDqjQuJe] 1 Plains Appa [6rlws0Y9bsjCxQpb7zzpYk] 0007_MTGTLA_JSTheme: Insurgent Jumpstart Theme Card Momo, Rambunctious Rascal Inspired Insurgent Kyoshi Warrior Guard Sokka, Lateral Strategist Glider Kids Kyoshi Warriors Hakoda, Selfless Commander Appa, Loyal Sky Bison Path to Redemption Stand United That's Rough Buddy Duelist's Heritage Thriving Heath 6 Plains [2t8d3N5Gn1ecBNsDqjQuJe] 1 Plains Appa [6rlws0Y9bsjCxQpb7zzpYk] 0003_MTGTLA_JSTheme: Alliance Jumpstart Theme Card The Duke, Rebel Sentry South Pole Voyager Kyoshi Warrior Guard Glider Kids Sokka, Lateral Strategist Kyoshi Warriors Suki, Kyoshi Warrior Jet, Freedom Fighter Mechanical Glider Sokka's Sword Training Path to Redemption Fancy Footwork Thriving Heath 6 Plains [2t8d3N5Gn1ecBNsDqjQuJe] 1 Plains Appa [6rlws0Y9bsjCxQpb7zzpYk] 0003_MTGTLA_JSTheme: Alliance Jumpstart Theme Card The Duke, Rebel Sentry South Pole Voyager Inspired Insurgent Glider Kids Sokka, Lateral Strategist Kyoshi Warriors Suki, Kyoshi Warrior Jet, Rebel Leader Mechanical Glider Acrobatic Leap Razor Rings Fancy Footwork Thriving Heath 6 Plains [2t8d3N5Gn1ecBNsDqjQuJe] 1 Plains Appa [6rlws0Y9bsjCxQpb7zzpYk] Blue 0012_MTGTLA_JSTheme: Katara Jumpstart Theme Card Gran-Gran Master Pakku Katara, Waterbending Master Rowdy Snowballers Sokka, Lateral Strategist Turtle-Seals Geyser Leaper Consider Watery Grasp Octopus Form It'll Quench Ya

yet this specific variant will, at the time of writing, set you back a cool 77,457.01 on Cardmarkets website
Leyline of the Guildpact Everything all at once Leyline of the Guildpact is a fascinating card