Merry, the Blesser

Whenever you cast a spell according to Merry's manna color identify activate her ability according which color spell you have casted
If you played a {b} spell Create a 1/1 black elemental token creature when it dies draw a card.
If you played a {r} spell Create a 1/1 red elemental creature token when it dies Put a +1/1 Counter on a creature
If you played a {w} spell Create a 1/1 white elemental creature token when it dies gain 1 life