Investing six mana at sorcery speed is just asking to get blown out, especially when creature Terra dies to every removal spell from Shock upwards
You could now have triggered abilities that trigger when you unlock a door, allowing you to mimic the effect of a sorcery
6 Boreas Charger Can Search Up More Than One Plains Card Boreas Charger can actually search up more than one Plains card, though it has to leave the battle to do so
While lengthy combos can be frustrating, there are plenty of handtraps that are designed to stop them, and modern decks play a plethora of responses to combo decks
Tempestae Punishment Counter Trap card Effect: When the opponent has activated the effect of a spell/trap or monster card, negate that effect then destroy that card
Bladecoil Serpent is beautiful in this deck and gives tremendous value from turn 6 onward