"The seedling you save today may be the sheltering boughs of generations to come."

Leaf-Crowned Visionary

Other Elves you control get +1/+1.
Whenever you cast an Elf spell, you may pay {G}. If you do, draw a card.

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Leaf-Crowned Visionary's ability triggers when you cast an Elf spell, and it resolves before that spell resolves. You may pay {G} to draw a card even if the spell was countered or Leaf-Crowned Visionary was removed from the battlefield in response.