Avenger of Zendikar is a mythic Creature — Elemental card from Secret Lair Drop (SLD), collector number 158. Current market price: $25.80 (foil $27.90), TCGplayer market prices via Scryfall.
When this creature enters, create a 0/1 green Plant creature token for each land you control. Landfall — Whenever a land you control enters, you may put a +1/+1 counter on each Plant creature you control.