Those are good, but they arent as special
For anyone going entirely free-to-play and refusing to spend money on microtransactions for premium currency, the limited Stamina you get to spend on the feature each day is quite frustrating, since you only get a 20% chance of pulling the key card you're trying to add to your collection
SR Super Rare UR Ultra Rare SE Secret Rare UL Ultimate Rare PS Platinum Secret Rare CR COLLECTOR'S RARE QCSE Quarter Century Secret Rare Limited Limited Solemn Judgment X TRAP Counter When a monster(s) would be Summoned, OR a Spell/Trap Card is activated: Pay half your LP
Not only can you swap life totals, but Mister Negative rewards you for doing so by drawing cards equal to the life you lose
Players jokingly call it Magic's first Planeswalker, since it's got three abilities and has such an outsized impact
In this case, your Digimon was level 4 when this card's [All Turns] effect triggered, therefore you can delete a level 4 or lower Digimon.