The auto-regenerate is really good, and tapping other creatures to give this troll +20/+20 feels silly
Blue has it unconditionally, black lets you trade life for it, green often bases it on your creatures, and red has you discard cards in exchange for a draw, but white has almost nothing
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These card types are not punished by Balance, so you can get further ahead on board without Balance setting yourself back at all
(2004-10-04) If you take more than one damage at a time, sacrifice the permanents for that damage simultaneously
Level-less Xyz and Link Monsters cannot be used as Xyz Materials, except for the Number F monsters, "Number S0: Utopic ZEXAL", "Number 100: Numeron Dragon", "Number 93: Utopia Kaiser", "Exosisters Magnifica", and "Disaster, Dragon Ruler of All Apocalypses", all of which specifically require other Xyz Monsters as material