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Playing Rose Tyler will only cost you two mana before the mana tax hits but she can quickly rack up counters by attacking while you have cards suspended, making her one of the most valuable companion creatures in the set

I would treat this a little more like an Aether Vial for construction purposes however

Additionally you want to be running this in a mono green ramp deck and not one with any splashes which makes it narrower

The first allows you to draw a card at the end of your turn if either player lost four or more life in that turn, allowing you to draw a potential counterspell for your opponents upcoming turn