Requires monster cards in your graveyard in the first place.
Needs more monsters depending on the level of target.
Magical Merchant and Veil of Darkness can be used to easily put some monsters in the graveyard, though they can be risky and gimmicky at times. After banishing the monsters, you can summon Doomsday Horror to have increased attack or also to return the banished monsters back into the graveyard, or just use Escape from the Dark Dimension to special summon any high level strong DARK monster.
Banishes from Graveyard / Banishes from Graveyard for cost / Banishes for cost / Banishes from your Graveyard
Destroys Monster Cards / Destroys Attack Position Monster Cards / Destroys Defense Position Monster Cards / Destroys face-up Monster Cards
I have the same problem, now I'm losing due to time out. I had 5 monsters in my graveyard. Tried to remove 4, 2, even 1, 3 and 5 but it kept saying "The number is invalid. Please try another one". The monsters on the field was level 2 and 4 respectively.
If relinq still sucked one of your monster when you did that, you can't destroyed it by skull lair.
Because relinq still got a "protection" that's count as a spell card, and skull lair can't destroy a spell card.
So, first you have to destroy the card that relinquished took by attacking relinq, then, you activate skull lair.