What are some of your favorite card set formulas?
One of my favored sets for an easy to assemble decently strong deck is fairy. The mere uncommon fairy witch card which brings forth more copies of just fairy fire just simply gets stronger and stronger the longer the match goes on. Then it's just simply a matter of making a small deck so that you can get back to your important cards as quickly as possible (the fairy witch, and whatever draw/healing cards you got set up to help make the deck viable). Self removing cards help stream line the deck and if you have troubles making the deck go down to no more than 10 cards you can always use gluttunous fairy to help remove the less useful cards permenantly (or just simply sacrifice fairy fires granted by the witches to gain 30 height even).
My suggestion for easy deck building is to stick to 15 card decks. Have some draw more cards cards and focus on having an ultimate hand of no more than 10 cards. The 5 other cards are just filler that either remove themselves from game when used or less powerful cards that you intentionally remove with a card that removes other cards from the game so that your deck size ultimately slims down to no more than 10 so that you can hold all the useful parts parts of your deck in one hand. the draw cards cards are so you can quickly recover your full hand after using multiple cards in a turn.