And your opponent was likely legitimately laughing at you because part of this game is anticipation of what your opponent will play. Dumping all your eggs in a tall pile is very bad against many classes and the onus is on you to know this.
I know I would laugh at you if you did all that without baiting my removal on something else, especially if I was a class that was known for cheap removal/silence/poly effects.
If your approach to magnetic is analogous to your approach to BG, it is likely best if you do not play the mode very much because it will only make you angry.
There are many ways to win in the Battleground and stats is only one of them, the one favored by new and poor-quality players.
If you did not yet read the post that was shared, there is a plethora of insight that speaks directly to your frustration and the resistance you have received to your suggestions. The take away is that like top legend, top battleground has a different meta.
She is, without doubt, my favorite hero right now. She can scale to 6 faster than Omu, maintain a board the entire time, and her buddy works similar to Omu in that it provides guaranteed Tier 6 minions but it is better because it is discover. So broken in the right hands.