pokemon seviper card - Emerald 20/106 this attack does 120 more damage Seviper - 116/196 - Uncommon

The amounts needed depend on the rarity of that card

As their circulation is high, they are typically sold for around 1,000 to 2,000 JPY (~US$6.74 to ~US$13)

Any creature (regardless of attacking or blocking) who is dealt damage equal to or greater than its toughness is destroyed and placed in its owners graveyard

You can then flicker this card with something like a Cloudshift to get all the creatures back or use it as protection against a board wipe

This makes the deck highly susceptible to removal and strategies that limit interaction

You can try Ghor-Clan Rampager, but my immediate thought is that this was easily possible before and costs you a lot of life when you already have ways to push Nighthowler through that do other things