While this can be situationally powerful, especially if your opponent is running the likes of Yargle and Multani, its often difficult to leverage effectively in a multiplayer setting where threats can come from multiple angles
How many would you expect to find in 1,000 packs
And when you do manage to gang up and kill him, it's not like the Commander tax on a 3 mana leader is overly prohibitive to replaying Leo
We wanted it to do something you'd want to do first, and something green, so we made it an "impulse" spell (R&D slang for a spell that only looks at a limited number of cards from the top of your library and lets you take onein our quest to lessen shuffling, it's how we do a lot of "tutoring" these days) that got you a creature or land
However, I believe the information here goes beyond the Pokmon card bull cycle, so if you wish, take a look