It works in a relatively simple way
You pay the optional bargain cost at the same time you spend mana to cast a spell, and if its countered the cost is still paid
Crop Rotation Crop Rotation is one of the best ways to tutor for a specific land you need, and that has some implications
The downside, of course, is that games tend to end quicker, and she disproportionately helps out decks with a higher CMC curve
They mutate into the creature on top plus all abilities from under it.) Flash Whenever this creature mutates, you may return target creature an opponent controls to its owner's hand
I have only anecdotal evidence, but I have found recruiting people to Magic is always easier when you let them build their own deck, or at least choose/open their own precon