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Picture taken from Deviant art Updated answer based on wikia summary It's all explained in this wiki, see the summary section on that link

leisurely lowstake spins

Fortunately, the reward of giving your whole team +3/+0 or drawing three cards when you connect in combat is huge

You can send 1 WATER monster from your hand to the GY

Wind-Up Zenmaines is the best rank 3 XYZ monster in all of Yu-Gi-Oh, as its incredibly useful in any deck that has level 3 monsters

It usually says, starting Intensity: X. The intensity is like a level that applies to a spell or effect, and sometimes it increases depending on how many times the spell was cast (thats why it has a starting intensity)