Due to an internal miscommunication, the card title, mana cost, and rules text were swapped after the art had been approved, and the scene went to print depicting Thoden, King of Rohan as originally commissioned, Wizards of the Coast explained
If you need specific cards for a competitive deck, purchasing them individually from the secondary market is almost always more cost efficient than opening packs and hoping to pull what you need
Lets create a hypothetical scenario to help illustrate the point of synergy and what is meant by it
Thousand-Year Elixir and Concordant Crossroads are vital to use the mana from your creatures and cards like Augur of Autumn, Vivien, Monsters' Advocate, and Elven Chorus help you keep the chain going by playing cards off the top
( Melds with Graf Rats.) Graf Rats 1B Creature Rat 2/1 At the beginning of combat on your turn, if you both own and control Graf Rats and a creature named Midnight Scavengers, exile them, then meld them into Chittering Host