Cosmic Rose

Cosmic Rose enters the battlefield tapped. When Cosmic Rose enters the battlefield, choose a color.
{t}, Pay 1 life: Add one mana of the chosen color
to your mana pool. Create a colorless 0/1 Plant
creature token with defender named "Cosmic
Rose Petal." Then, if you control three or more
Plant creature tokens, sacrifice Cosmic Rose.
Many have tried to lengthen the power of these strange flowers, but their strength remains ephemeral.