This rule means one card's effect including onle protect other card, not other effect
(Forbidden Lance or Safe Zone with second effect are not in this range)
1.Anti card "A" + Protect A card "B"
is NOT stable than
2.Anti card "A" + Anti card "B"
In first case, if you draw only B, then will get a bad hand card.
遠比 剋人的A和剋人的B卡 還不穩
You meet with a Dark World
1.Curse of Royal + Macro Cosmos is worse than Banisher Radiance + Macro Cosmos
2.My Body As A Shield + Banisher Radiance is worse than Banisher Radiance + Macro Cosmos
If you draw only Curse of Royal or My Body As A Shield, then can't anti enemy.
If you would like to take Cover Card, please consier multi funtional cards like Safe Zone or Star Light Road, or can protect multi times like Imperial Custom, but they will increase the bad hand rate, considering other benefit to put, too.
Star Light Road:
If your card is destroyed by one for one can't lose, but afraid of all field clear cards, then you can use this to reverse situation.
If there are more than 7 continuous traps in your deck, meaning you get 1 continuous trap at start in average, so you can use this comfirm it's almost OK for making combo.
If you have other card can make combo with it, like Mist Valley Falcon, you also consider this.
If there is card in your deck can't be replaced or the same effect card by ohter card(is not like Macro and Banisher), and it'a very important key card in your system, then you can try it.