Jam Defender this ain’t.

RD/KP12-JP064 バッファード・スライム Buffered Slime
Normal Trap Card
[REQUIREMENT] When a Level 8 or lower monster your opponent controls declares an attack, you can activate this.
[EFFECT] Send the top card of your Deck to the GY. During this turn, you take no Battle Damage. If your LP is 3000 or more, you also take 2000 damage.

Source