They are destructive and completely unnecessary
Also, you are not limited to just playing the preconstructed decks you buyyou can use all of the diferent cards you have to create totally new decks
Maintaining Your Board State Maintaining your board state means trying to create a presence at all times by being able to do something every turn
Here are ten staple card draw cards that I often consider when deck building Description : Rhystic Study is an enchantment that allows you to draw a card whenever an opponent casts a spell unless that opponent pays an additional mana

Cards Between $5-10 The Fire Crystal Sword of the Animist Three Visits Primeval Titan Yuna, Grand Summoner Dark Confidant The Wind Crystal Jodah, the Unifier Genji Glove Nibelheim Aflame Loran of the Third Path Cryptic Command Aettir and Priwen Walking Ballista Command Beacon Tifa, Martial Artist The Earth Crystal Reanimate Y'shtola Rhul Ultima Weapon Cards Between $10-15 Dark Ritual Isshin, Two Heavens as One Tymna the Weaver Azusa, Lost but Seeking Diabolic Intent Vial Smasher the Fierce Lightning, Army of One Summon: Knights of the Round Kinnan, Bonder Prodigy Starting Town Final Fantasy Promos, Alternate Art, and More Final Fantasy is chock-full of alternate versions, with most characters having two versions, 10 of them having three and Cid, Timeless Artificer having 15