Rivalry of Warlords

While you control a face-up monster, you can:

• Tribute Summon a monster using your only face-up monster, even if it has the wrong Type. (EG: Your only face-up monster is "Treeborn Frog". You can Tribute it for "Caius the Shadow Monarch").
• Take control of an opponent's monster with EG "Brain Control", even if it has the wrong Type. (If it has the wrong Type, it's immediately sent to the GY).
• Summon/Set monsters face-down, even if they have the wrong original Type.
• If you control no monsters, you can Summon multiple monsters with different Types with EG "Rekindling". (After they're summoned, send monsters you control to the GY so that you only control 1 Type).

While you control a face-up monster, you cannot:

• Ritual/Fusion/Synchro Summon a monster with the wrong Type, even if you would use the monsters you control as tribute/material. (EG, you can't use 2 Sea-Serpents to Synchro Summon a Psychic).
• Flip/Normal/Special Summon a monster with the wrong Type.
• Summon "Lava Golem" (unless all monsters your opponent controls are Fiends).
• Summon "Uria, Lord of Searing Flames" (unless you control no monsters, or only Pyros).

If a Set Monster is attacked:

• It's not sent to the GY until After Damage Calculation.
• Its Flip Effect will activate, but it is not "destroyed by battle" (EG, Shura and Mystic Tomato will not trigger, since nothing was destroyed by battle).