Turn 10 arrives with any minion for the paladin in play. They use kings (+4/+4), might (+3 atk), and then finish with a good old blessed champion (Doubles a minion's atk) at this point even with a 1/1 minion in play it now does 16 damage in a turn and is uncounterable. If it is a minion that starts with 5 attack it is up to 24 damage in one turn.
Now worst case, as it was earlier for me, a fellow played a giant for zero cost and I couldn't clear him in one turn, so then he got all those buffs and ended up with 30 damage in a single turn straight out killing me when I was in total control.
This is a one turn game ender and I'm not a fan of that happening. Just my 2 cents.