tyranid cards mtg Harridan Magic: The Gathering Universes Beyond:

Since you have the infrastructure to hit already, why not add in two more combat damage triggers that also boost the power by two and thus the Commander Damage clock is sped up as well and giving two key protections from targeted removal like Beast Within and burn like sweeping Blasphemous Act

Noctis, Prince of Lucis Noctis brings a solid body, and the ability to keep bringing back artifacts at a cost of 3 life, and the artifact's mana cost

A fight put off forever is already won

Once transformed into Tovolar, the Midnight Scourge, Tovolar grows from a 3/3 to a 4/4 and gains the ability to let its controller pay additional mana to raise the power of werewolves, providing them with trample.

Mixing Impact Tremors with Secure the Wastes along with an unblockable Arabella with double triggers could just be game ending