Delver of Secrets is a 1/1 that can transform during your upkeep, so it might turn into a 3/2 on your second turn, but it's definitely still conditional and not guaranteed. Wild Nacatl is a 1/1 for G that gets +1/+1 for having a Mountain or a Plains, so again, you're not getting a vanilla 2/2 on turn 1 for it.

Also neither of those are in standard right now.