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
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
Until then, may you conquer the rough elements of Amonkhet .
One thing to be aware of is that you may pull some Commander-only cards out of Collector Booster packs, so you'll want to check the set symbols before building Standard decks
What are you exiling to this
If you can amass three more Birds using a combination of the cards above, however, then it becomes a truly terrifying threat