That means you can play a face-up Falcon turn three, Grift on your turn four first to trade a Spyglass Siren for a Sheoldred, and then immediately swing with the Falcon and take back your Siren, leaving your opponent with nothing
The first place that design experimented with minigames was with bidding on cards like Illicit AuctionIllicit Auction or coin flips with Mana ClashMana Clash
This will give you the usual infinite tokens from Appa, but also infinite experience counters, which can pave the way for more shenanigans later
You can even use your cell phone as one with the right apps
In a Two-Headed Giant game, life gained by your teammate won't cause Phial of Galadriel's second ability to apply, even though it will cause your team's life total to increase
And I think Urabrask the Hidden holds the most interesting out of those three