It's attack is only 2, so played three times it's only giving +6 attack, not +9, which is more reasonable considering the mana cost.
If possible that would be the best option, as it impacts each card as little as possible. As someone else was pointing out though, depending on the coding, that might not be possible, sadly.
That would be a rather major nerf to it, dropping it from a very strong looking card even outside the OTK to a much more iffy place. You're effectively removing 1/2 of total stats from it as well as taking away the stickiness of the deathrattle.
If they do need to remove the deathrattle to make this work, all I can think of is that they could make it a battlecry instead, but I wonder if that might just be too much? Then it's a straight-up unconditional 4/5 for 3. We've only seen that before on the one Paladin minion that required Dragon synergy to work, which never worked out mostly because Dragon Paladin has never come together as a deck.
Eh, nobody cares about Wild anyway .
Though seriously, I do think they might just shrug and let that pass in Wild, unless it becomes extremely common and what few Wild players as exist start raising a fuss about it. Though it does really make it feel like giving a card both Echo and Magnetic in general is perhaps an inherently problematic combination and they might want to rethink doing so at all.