Our life-gain creatures put pressure on our opponent to remove them, but its one of those situations in which the opponent is really not happy using resources doing so
Infinite Power
But while the debate doesn't seem to be over, so far they've been overruled by the majority of R&D, who favor the current approach of genericising some creatures that could've been legendaries and using as many generic creature concepts as possible
As far as we can tell, the card that finally tipped The Gaffer over the edge was Ragost, Deft Gastronaut, the most popular commander in Edge of Eternities
And still 20 years on, its one of the go to rare Yu-Gi-Oh cards, holding a pricetag of around $1,500
Clive's Hideaway's last ability only cares if you control four or more legendary creatures at the time it resolves