That’s not true. Spider bomb, venmonizer are weak minion on board and are easy to get rid by spells. You should keep playing after Molten giant rank, since all mage I faced know how to deal with them easily, ie not just play a giant on board but instead frozen all opponent minions and do the giant combos. Next turn (depends on RNG it can be as early as turn 4-5), 2-3 giants on board and aggro deck has no way to remove them.
I love how people like you play T1 decks enjoying your super high 70% winrate against almost all classes that are being played, but come here to complain about that one specific class that you have only 40% wr. Let me tell you some news, in this game your deck isn’t supposed to have a 70% wr across the whole board
Generally a T1 deck shall have at least 55-“~60+ win rate against other deck. Depend on player skills and the meta, 70% is not that hard to achieve before legend rank.
Perhaps mech hunter is not a good example to show how broken Conjurer’s calling is, as aggro deck isn’t supposed to have a high win rate :-/
The point is even such a strong t1 deck have poor matchup against, not by skills but heavily based on RNG drawing.