Yu-Gi-Oh! has 6 phases, of which only 4 are actually visible to a player playing in real life.
Main phase 1, battle phase, main phase 2, end.
I personally do not like the way these phases work, and am considering designing new rules that allows players to play without these phases being visible, so that there's only 1 phase where you can attack or play magic cards (and then end turn).
The one problem that my friend has pointed out to be is that this changes the effectiveness of certain cards like Call of the Haunted.
If I have no monsters on the field and the opponent has a panoply of monsters on the field, I would normally be able to save myself with Call of the Haunted. As a trap, I can activate it when the opponent attacks, and revive a strong monster to defend myself. However if the opponent has a magic card such as exiled force, they can kill my strong monster immediately, something they wouldn't be able to do in the attack phase of normal Yu-Gi-Oh! rules.
Now my solution to this is to add special exceptions to cards like Call of the Haunted, so that they or the monster they summon cannot be targeted by magic cards within the same turn as their activation.
Would that fix the problem of trap card balance? Are there any problems with my proposed system?
Some context: This is a new rule set based on Yu-Gi-Oh! rules. I don't intend to try to get anyone to play Yu-Gi-Oh! with my rules.
Edit: Some more context: Not working on existing cards, I have new cards.
Here is a video demonstrating what I mean:
In this new game note that there are no attack/main phases, just one END TURN.