The full sentence is:
何{なに}もかも手{て}にした気{き}でいたんだ
For now I think 何もかも手にした comes from 何もかも手にする 'to obtain just about everything / almost everything' but I can't understand the purpose of the rest and how it changes the meaning of the phrase.
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why "just about" "almost"? 「何もかも」"anything and everything" – Chocolate♦ Oct 21 '18 at 3:10
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'Anything and everything' was one of the two definitions that Jisho.org provided. The other one was 'Just about everything' which did more sense in the context. – Chrollo Oct 21 '18 at 3:19
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hee.. 何もかも means すべて, 全部... So "just about everything" "almost everything" can also mean すべて? – Chocolate♦ Oct 21 '18 at 3:26
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So It would correct to say that 何もかも手にした means "I've got everything"? if that's correct how does 気でいたんだ change the sentence's meaning? – Chrollo Oct 21 '18 at 3:33
～～した気でいる means "to (keep/stay) think/imagine/feel(ing) that one did~~". (≂ ～～したつもりでいる) (cf. 「～～した気になる」 "to think/feel/imagine one did~~", 「～～のつもりでいる」 "to fancy oneself as~~")
何もかも手にする means "to gain/obtain (anything and) everything".
So 何もかも手にした気でいたんだ literally means "I thought/imagined that I had obtained everything."
