the only thing i can think of for an infinite summon is to use an object. basically have an object constantly cast a summon spell on self, heres how you would do that.
in the construction set, create a new enchantment. in the object window, under 'magic' click on 'enchantment. then right click on any of the enchantments (doesnt matter which) and select 'new'. then in the window that pops up fill in the ID as XSummonEnchant and set the type to Apparel. then create a new effect for summon dremora and leave the duration as 0.
after that go to the clothing tab under the 'items' section in the object window and search for EnchRingFlame. double click on it to bring up its properties and whatnot. change the ID to "XDremoraRing" and change the name to "Dremora Ring". now the enchanting for the ring currently says EnAppFire.. click the down arrow and search for "XSummonEnchant". it should be the absolute last one in the menu since it begins with an X (thats why i started the ID with an X

). after that click the ok button and itll come up with some message to let you know that you "changed the forms editor ID and ask to create a new form. click yes (this basically creates the modified ring as its own object and keeps the original intact)
now all thats left to do is place it in the game... under 'world objects' in the object window, click on container, then click on clutter. then search for 'CrateClutterMiddleSame02' and double click on it. with the properties window opened go back under 'items' and in the 'clothing' section, find 'XDremoraRing' (again it should be at the very bottom of the list since we started it with X) and drag and drop the ring into the inventory list (under 'Object ID').. then save the plugin file..
now load the saved plugin file and start oblivion.. in the Imperial City Market District, outside the Black Horse Courier, there are two boxes (a small one on top and a larger one on the bottom). your ring should be in the bottom one
also the ring will show up in all boxes that are labeled as 'CrateClutterMiddleSame02' so you can just sell the extra ones you find as you play. (i would have had you make its own special chest and place it somewhere in the game but that takes a lot more time and editing in the construction set)
hope this helps you out, also, im sorry if it sounds like im talking to a 4 year old, im not trying to be offensive, i just dont wanna accidentally leave something out...
now. the main reason im at this forum is because im currently trying to add a third spell to the list upon starting a new game (basically get any new character to have flare, heal minor wounds, and the custom one i made).. if anyone can shed some light it'd be appreciated