Summoner of Illusions states "Tribute 1 other monster". It cannot tribute itself for its own effect.
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Yes, of course. Nothing about tribute summoning itself stops you attacking, only if you used something like Soul Exchange that forces you to skip your battle phase.
The Creator God of Light, Horakthy is not an official Yu-Gi-Oh! card produced by Konami. Therefore, the answer to this question cannot be determined. Also, in the Original Anime, there was no real distinguishable effect besides being able to defeat Zorc Necrophades which is not a real card itself.
The difference between Mandatory and Optional Triggers is that Optional ones say 'you can', Mandatory ones don't. Mandatory ones must be carried out if possible, even if you don't want to.Man-Eater Bug's effect is a Mandatory Trigger, it must activate, even if the only thing it can destroy is itself.
Every unlockable is on the bottom of the yugioh card itself. They are 8 digit numbers that unlock those cards. To post all of them would take too much space. Look on wikipedia for pictures of the cards. Here are a couple good cards to start you off: 44095762 Mirror Force 62279055 Magic Cylinder 75830094 Horus Lv.4 11224103 Horus Lv.6 48229808 Horus Lv.8
Enuring itself is a word... Enuring itself is a word...