Once on the board, their abilities allow them to generate massive amounts of momentum while protecting each other from opposing challenges
It sounds simple, but as you can see, theres a lot going on when it comes to MTG
Standard format Standard is a dynamic format where you build decks and play using cards in your collection from recently released Magic sets
Though this card also has the Reckless ability, meaning that it cannot be used to quest and must challenge, its an excellent pick for the early game as it can help keep your opponent from finding a foothold with weaker characters
So whether they are being challenged, challenging, being damaged by items, songs, or effects
Often you want to use it in your upkeep to look for a card to Dredge, but if you already have the exact card you want to dredge in your graveyard, its better to dredge first so that, if you hit a Narcomoeba, you can Shriekhorn in response to the trigger to look for an Amalgam to return as well