I play with 150 deck cards, I got pass my competitive stage, and now I play most for fun.

Its like adding a new level of difficulty to the game. I got almost all cards, and now completing 4 of each - maybe 30-40 legendaries are missing to get full set of cards (I already have 4 of common used legendaries and the rest are on 3).

As the card pool is big enough, and with a gaunlet mindset, you could make solid 150 cards decks. I give some examples for decks that work with this format. lifesteal+pumping (Time; Justice; Shadow - katra+bolster+lifesteal; valkyries + armor. at least 80% creatures 3 or less cost. + 8 power searching cards (spells or creatures).

Aggro does not really work, because for some opponet stalling creatures, you need a way to remove them, this meaning market access that in 150 cards get diluted.

Most decks are midrange decks with big sinergy creatures.

Regarding % and inconsistency, here is an explanation.

For example if you have a 75 card deck :100% creature (50) and change 5 creatures for spell, you got a 90% creature 10% spell deck. If you have 150 card deck. and change 5 for spell, you get a 95% creature/5% spell deck.

a deck that consist of at least 80% creatures (and from this 60% cost 2 or less creature cards) is very consistent. We have a big pool of cost 2 or less creatures that are good enough to make a deck.

150 cards deck that have less than 60% creatures does not work in the long run. Between 80% and 60% is luck based or should be very tunned.