While Ghalta can easily allow you to flood your board and set up for the win, it usually requires outside support from haste or trample to be truly effective
If you aren't shut down by removal, your biggest problem playing Niv-Mizzet, Visionary is going to be decking yourself out
She has a Mardi Gras mask, and confetti falls across a lovely night sky, speaking to her New Orleans traditions
The set is top-shelf, and each color (which includes multicolored and artifact/land) is spot-on
It's also close to a one-sided wipe in a very popular archetype, though obviously if any of your foes bring +1/+1 counters too, its strength goes down significantly
FromTheShire: 3 life and 2 bodies can be absolutely huge against aggro for sure