While he does have to use your own mana, this effect is still absurdly powerful and can deny opponents the strategic cards they need, while setting up less advantageous cards to be their next draw
It's a lot easier to construct something kick-ass if you've bought a metric crap-ton of boosters
They are how most players first interact with a new set, and they remain the most popular way to build a collection, open cards for fun, and play limited formats like draft and sealed
First off, a set booster is a 12-card pack meant to be cracked, not drafted, and they dont have to be color or rarity-balanced
Even so, this still looks pretty good compared to Azorius Charm for control decks
When you put this glue on your card stock, it will be blue at first