I say this because not only is Clauncher extremely slow to do damage, but if you try and attack for only one energy card it may not work because Bubble is a coin flip based move
Gravekeeper's Assailant X DARK Level 4 [ SpellcasterEffect ] ATK 1500 DEF 1500 When this card declares an attack while "Necrovalley" is on the field: You can target 1 face-up monster your opponent controls
It can then be accessed by tapping the medal icon
In addition , it is vulnerable to the Sealing Sword of Darkness , which forcibly changes to a defensive display , and its compatibility with the Dragon Destruction Swordsman - Buster Blader, which has an increased hit point and a penetrating effect in display format change , is particularly vicious
This is a continuous spell card and while its on the field, all your opponents monsters lose 100 attack for each of its own levels
When a face-up monster you control is destroyed by a card effect and sent to the Graveyard (except during the Damage Step): You can Special Summon this card from your hand