Essentially, it says that any card with 3000+ ATK needs to have some kind of restriction
Isolde, Belle of the Underworld X DARK Level 4 [ Zombie / Effect ] ATK 1000 DEF 0 If you control "Tristan, Knight of the Underworld", you can Special Summon this card (from your hand)
The big issue comes from CRZ Kyogre which decimates your bench, and is equally recurable
The Spell Card broke the Deck, being able to loop Six Samurai cards that could Special Summon themselves to get an infinite amount of counters
Hunt the Weak Sorcery Put a +1/+1 counter on target creature you control
Since this tide-turning card is limited to only 1 copy per deck, duelists seeking to abuse this tactic will need to use the effects of other cards to return the single copy to their hand to be played again on the desired turn