Delendune, Elemental Adept

When Delendune, Elemental Adept enters the battlefield, create X 1/1 green Elemental creature tokens, where X is equal to the total amount of
mana in your mana pool.
Whenever an Elemental enters the battlefield,
put a trample counter on it.
{x}{w}, {t}: Target Elemental gets +X/+X and
lifelink until end of turn.