If you can look at a hand and do at least one thing you've set out to do, that which the deck is designed to open, you've done more than most midrange-y 'slop' piles
You can't really set out to build an archetype like mono green control and expect to be winning the event with it but you can feel extra good about it if you do
No, this ability is not cumulative
Here are the cards you need to keep an eye out for: Carnivine #158 (Full Artwork / One Gold Star) Gastrodon #161 (Full Artwork / One Gold Star) Manaphy #162 (Full Artwork / One Gold Star) Rotom #164 (Full Artwork / One Gold Star) Giratina #167 (Full Artwork / One Gold Star) Cresselia #168 (Full Artwork / One Gold Star) Rhyperior #169 (Full Artwork / One Gold Star) Hippopotas #171 (Full Artwork / One Gold Star) Spiritomb #172 (Full Artwork / One Gold Star) Garchomp #175 (Full Artwork / One Gold Star) Staraptop #176 (Full Artwork / One Gold Star) Glameow #178 (Full Artwork / One Gold Star) Rewards: 36 Wonder Hourglasses, 12 Pack Hourglasses and 10 Shop Tickets
On its own, The Library A Gift for Belle can be quite frustrating to deal with if opponents dont have easy Location removal
One could argue the same merits for Black Lotus however I would content that its over powered nature both reduces the options and vastly increases pure luck based wins