It needs another creature in order to do so
Firstly, she taps for mana, and when that mana is spent on a creature, it enters with two +1/+1 counters on it - representing her literally summoning a powerful monster to the battlefield
If you proliferate multiple times, you don't have to choose the same set of players and/or permanents to get additional counters each time
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In Magic , it can only bring back cards from your graveyard with a mana value of four or less, reflective of its relatively basic form of restorative magic
If an effect allows you to play a land or cast a spell from among a group of cards, you may play or cast a modal double-faced card with any face that fits the criteria of that effect