Forum:Rainbow Ruins clarification

Ancient City - Rainbow Ruins Spell Card / Field Spell Effect: This card gets these effects, based on the number of "Crystal Beasts" in your Spell & Trap Card Zone. 1+ This card cannot be destroyed by a card effect. 2+ Once per turn, you can halve the battle damage you take. 3+ You can send 1 "Crystal Beast" monster you control to the Graveyard to negate the activation of a Spell or Trap Card and destroy it. 4+ Once per turn, during your Main Phase, you can draw 1 card. 5+ Once per turn, during your Main Phase, you can Special Summon 1 "Crystal Beast" card from your Spell & Trap Card Zone.

due to personal losses from unclear rulings, i need some help with some of these effects. Effect #2: Do you halve the Battle Damage you take during the turn or do you halve just one monster that inflicts or attacks directly? Effect #3: Can you send a "Crystal Beast" from your monster zone to negate and destroy trap cards? This was brought up by a veteran in my area and he said that it has to be from the spell and trap card zone, not from the monster card zone. i didnt want to be a pain, but i did want to argue cuz it does say, "control". if it has to be from the spell and trap, it would say instead, "control, from your spell & trap card zone." or something of the like, correct? Effect #4 & #5: Say you drew a card while you already have a AC-RR on the field, while having 4 crystal beasts in your spell/trap zone. you draw and summon Sapphire Pegasus. place one "Crystal Beast" in the S/T zone. Then you use effect #5. Now, you are back at the beginning with 4 crystal beasts in the s/t zone and 2 new monsters due to a draw from effect #4 and #5. can you replace the AC-RR with another one in your hand to repeat the same effects?

thanks.