Having a recurring creature can be good with sacrifice outlets such as Vicious Offering and Whisper, Blood Liturgist, to say nothing of Siege-Gang Commander
You cant cheat out expensive cards, but Gandalf adds some super-charged Panharmonicon action to your deck and at minimum gives your commander flash
If you happen to have six mana sitting around, you can always buff her up too, but really you just want to make as many tokens as possible before you get wrathed
What are you exiling to this
Scenario 3 Grief / Undying Evil Turn 1 You Play Grief, exiling a black card Remove a card from opponents hand Play Undying Evil, targeting Grief Remove a card from opponents hand Turn 1 Opponent Turn 2 You Cards in hand: 2 Cards in opponents hand: 4 Result: This is very similar to Scenario 1, but with two big flaws: your opponent ends up with one more card by comparison, and you have to run Undying Evil