User blog comment:Deedlit11/Googology in Magic: the Gathering/@comment-5150073-20130412144609/@comment-1605058-20130413062931

In some ways, Ikosarakt is right. We can't have universal machine on anything with bounded informatical storage. But these are just stupid physical limitations. When proving T completeness we often add 'if equiped with unbounded resorces' (like space, time, tokens)