Simic Salve

If this spell is the first spell you've cast this game,
you may cast it without paying its mana cost.
You gain 3 life and draw a card, then you
may put a land card from your hand onto the battlefield.
Create a 3/3 Elk creature token.
Destroy target land if it's a Plains.
Flashback-{u}{u}{g}{g}
When you Flashback Simic Salve create
a 6/6 Giant creature token.