Wow... so I'm really late at seeing this discussion but here's my two-cents...
I have a Type 4 deck that I am always improving. It has unfortunately become more and more of an obsession and I sometimes am tying a lot of my time/cards into acquiring and building up this deck. Then I obsess with working on foiling it out as much as possible. I know my stack is way more expensive than many others would ever do. My decks focus is on splash and hay-makers. The downside to that is that there has to be a major balance in wrath effects and removal along with counter. I have also worked it into a graveyard manipulation stack as well. Currently the deck is almost 500 cards which is where I will cap it. We generally have 4 to 8 players at a time but have had up to 10 (hence why it is as large as it is).
I find that utility cards are immediately elevated in the stack. Counterspells are great if they have a little extra utility added such as Arcane Denial, Countermand and Draining Whelk. The graveyard, as I mentioned is a great "extra resource" in type 4. We play with independant libraries and graveyards (divvy cards up face-down after shuffling evenly). This makes cards like Debtors' Knell and Rise of the Dark Realms dangerous cards for everyone. I also have found that you will want several shapeshifters/clones. May I suggest Clever Impersonator and Vesuvan Doppelganger. Overall, when building a stack be very careful to not allow players to win in one turn (fireball type spells, infinite creature spells or infinite pump dragons/creatures). Make sure to have a good balance of creatures and removal and have fun. It is easy to weed out overpowered cards, but I recommend keeping at least a few in (looking at you Griselbrand).
Oh, we also keep max hand size at 5. Too easy to get out of control at anything higher. Great discard spells come in handy too like Myojin of Night's Reach, Wit's End and Head Games.
I have a Type 4 deck that I am always improving. It has unfortunately become more and more of an obsession and I sometimes am tying a lot of my time/cards into acquiring and building up this deck. Then I obsess with working on foiling it out as much as possible. I know my stack is way more expensive than many others would ever do. My decks focus is on splash and hay-makers. The downside to that is that there has to be a major balance in wrath effects and removal along with counter. I have also worked it into a graveyard manipulation stack as well. Currently the deck is almost 500 cards which is where I will cap it. We generally have 4 to 8 players at a time but have had up to 10 (hence why it is as large as it is).
I find that utility cards are immediately elevated in the stack. Counterspells are great if they have a little extra utility added such as Arcane Denial, Countermand and Draining Whelk. The graveyard, as I mentioned is a great "extra resource" in type 4. We play with independant libraries and graveyards (divvy cards up face-down after shuffling evenly). This makes cards like Debtors' Knell and Rise of the Dark Realms dangerous cards for everyone. I also have found that you will want several shapeshifters/clones. May I suggest Clever Impersonator and Vesuvan Doppelganger. Overall, when building a stack be very careful to not allow players to win in one turn (fireball type spells, infinite creature spells or infinite pump dragons/creatures). Make sure to have a good balance of creatures and removal and have fun. It is easy to weed out overpowered cards, but I recommend keeping at least a few in (looking at you Griselbrand).
Oh, we also keep max hand size at 5. Too easy to get out of control at anything higher. Great discard spells come in handy too like Myojin of Night's Reach, Wit's End and Head Games.
Enjoy!