Never heard about this game on ATARI Jaguar.
I tought the only hockey game for this machine was Brett HULL's NHL hockey.
You can get it on ePay :
http://www.ebay.com/itm/Hockey-Atari-Jaguar-Cartridge-New-/130899455337?pt=US_Vintage_Computers_Mainframes&hash=item1e7a372d69
Rygar is a good game on ATARI Lynx. Just try it with an emulator.
Unlike Ninja Gaiden that's a common game.
I'm almost sure you can get it for less than $10.
(Back to the question)
Yes, that's a true RGB machine. I hook it up to a VGA screen using a HD9800/GBS82X0 video interface.
Check this out right here :
http://atariage.com/forums/gallery/album/1218-atari-7800-scart-to-vga-using-hd9800/