Highlighting a card from Adityas list, I wanted to first talk about Kashtira Fenrir in the Side Deck
Then, when it hits something, it exiles itself face down and turns into a foretold card, letting you cast it later for cheaper
Finally, we gave the player a secondary way to advance the Story: they could use mana to progress it
Like most Magic: The Gathering cards, the value of Winter Orb depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Foreign Black Border)
In doing so, another effect can be activated from the Level 7 "Mermail" monster to add a card to their hand
When you have a mana sink in play, you might still prefer to draw more spells, but when you inevitably start drawing more lands than you need, at least you can put them to some use