Magikill and Giants are really good in end game, and crap in early game. They should be slightly better in early game and worse in end game. Some rework ideas I have is;
-Magikill max minions 3. (Buff)
-Magikill minion summon rate 25% slower. (Nerf)
-Magikill health +10. (Buff)
-Giant health +250. (Buff)
-Monstrosity upgrade 1, 10% health increase, +5 damage. (Rework)
-Monstrosity upgrade 2, 20% increase, +10 passive healing. (Rework)
-Monstrosity upgrade 3, 30% health increase, plus 0.5 stun duration. (Rework)
-10 second longer train time. (Nerf)
I hope that the changes shall make an army of magikill possible to beat, and giant spam easier. These changes would allow people to use giants without monstrosity needed, and magikill in non-turtle like decks.