This is the card flavor text for the Tempest version Counterspell
SR Super Rare Smoke Mosquito X DARK Level 1 [ InsectEffect ] ATK 0 DEF 0 During damage calculation, if you would take battle damage from an opponent's monster's attack (Quick Effect): You can Special Summon this card from your hand, and if you do, the damage you take from that battle is halved, also end the Battle Phase after the Damage Step
He offers you an extremely efficient repeatable reanimation spell in his activated ability, which turns the risen creatures into Nightmares that benefit from his Lord effect, but on the other side of the coin, all of his misshapen minions melt away into exile as soon as Chainer himself leaves play
After you get your extra card, you want to consider some Trap options to help keep the first monster you Summon on the field so that you can follow up with another Normal Summon to draw 2 more cards
That said, its card disadvantage in a format where spot removal is already card disadvantage, so whether or not you decide to run this card really depends on your meta and the sorts of commanders you play against
While F&B probably wont be killing Magic: The Gathering anytime soon, the game has maintained a strong reputation and a dedicated player fanbase