If you build your deck around it by having multiple artifacts, enchantments, and tokens to sacrifice it almost guarantees you will always have something to bargain when the time comes
You can use Sky Return to bounce Shaymin back to your hand after its ability is used, protecting your easy two-prize target while allowing you to reuse Set Up next turn
I pack my orders in the bubble mailers and always try to include something extra, maybe a loose pack or other duplicate card, just something so the buyer feels like this order was special or different
It just makes you feel safe, if they try and smack you in the face you can say no and if they don't you can spend your mana and dig for action or land drops
Madam Mims ability to bring cards back into your hand or into your discard pile combos perfectly with Merlins ability to generate lore, grant other characters additional strength or draw cards as his cards enter and leave play