In some cases, you may even be able to barter with the information
Look at the top 12 cards of your deck and attach any number of Energy cards you find there to your Pokmon in any way you like
Since there were exactly 48 Puzzle Cards, no other Duelists held any at the end of the preliminaries
Since it's mana free, you can use it when you've tapped out, or cast a mass removal spell like Damnation or Life's Finale to save it proactively not reactively to something else and have the only creature left on the battlefield
Chaplain of Alms // Chapel Shieldgeist Ward 1 isn't a huge deterrent against targeted removal, but sometimes it's enough to keep your creatures alive for an extra turn
Shisato, Whispering Hunter is a scion of Kamigawas lethal Orochi snake-people, and can potentially stun an enemy players mana many turns in a row as long as his blows can reach them