You don't choose a target for Ambulatory Edifice's last ability at the time it triggers
In decks that dont run green, Solemn Simulacrum is a bit of a staple way to ramp
In Pauper, the powerful cantrip is commonly a four-of in High Tide combo decklists
Gavi lets you pay zero instead of the cost of the first card you cycle on a turn, and then whenever you draw your second card for the turn, you create a 2/2 Dinosaur Cat creature token
Because you get an equal number of growth counters to your +1/+1 counters, then something that arrives with counters, like Triskelion or Spike Weaver, will give you many growth counters at a time
The card stayed mainly as I designed it, with one big change: I created the card to be an uncommon