Drawing a card whenever you cast a spell with mana value 5 or greater is excellent with sweepers like pre-rotation Sunfall, where you can kill every creature and draw a card, with removal spells like Leyline Binding, or with the various Overlords that can enter the battlefield for cheap via impeding, like Overlord of the Hauntwoods
Redeem Rewards : Unlock in-game content and accessories at no cost by completing quests and objectives
Yet Kai had accumulated over 100 Pro Points all by himself
Best for: High-value cards ($200+), rare/unique items, auctions on hyped releases, sealed product
Altogether, its a lovely value engine
In a similar vein to Xantcha, Sleeper Agent, this legendary creature makes an opponents creature an active detriment to their board state, and it incentivizes them to pay 3 mana to get rid of it and give the rest of the table a card