{G}: Regenerate another target Elf.
{2}{G}{G}{G}: Elf creatures you control get +3/+3 and gain trample until end of turn.
Ezuri’s first ability can’t affect itself, but its second ability does.
Only Elf creatures you control when the last ability resolves will get +3/+3 and gain trample until end of turn. Non-Elf creatures that become Elves or Elf creatures that enter the battlefield under your control later in the turn won’t get the bonuses.