Normally to use the Disk you play it tapped and then have to wait until your next turn to get it active
Most interestingly, the activated ability on Hauntwoods Shrieker allows you to flip face-down cards up for free, even your opponents' if you want to maybe because its a bad card, or to make them lose the flip-up trigger timing
That is because they don't have enough money to buy new original cards
These are typically the most wanted cards, and are featured just once in every pack
As long as you're not getting mana screwed by your card draw, this is a pretty consistent way to proliferate
We have a lot of planeswalkers that are on-color for control decks of all varities, powerful creatures that can be borrowed from the midrange decks, and Dragons that can be used exclusively