If you cast Blast from the Past using flashback, it will be exiled rather than go back to your hand
Cards that make duplicate, extra, or double the tokens abound here, so if you can build something to take advantage of that excess while surviving through the turns when your stuff is a bit durdly and slow, you will have a powerful deck that can bide its time and then pop off
Goblin siring is a bit murky to me
The Great Aerie Plane Tarkir When you planeswalk to The Great Aerie and at the beginning of your upkeep, bolster 3
He has a very cool design, but he might create board states that are too complex for newer players by doubling all of your tokens
Its seen some play in Constructed formats, and its a good value creature, but nothing special