Maryill, Nature's Song

When Maryill, Nature's Song enters the battlefield, create a treasure token.
At the beginning of your upkeep, target land you control becomes an X/X elemental creature
token with Hexproof and Haste, where X is the
number of treasure tokens you control. It's still
a land.
Whenever a land creature you control deals
combat damage to a player, create that many
treasure tokens.