mpc cards mtg MTGNexus creatures you control get +X/+X and gain haste until end of turn MTG War of the Spark:

Due to Nissas Landfall ability, she can cast her ultimate when played, stick around longer on the battlefield when targeted, or simply turn that land played into a 3/3 Elemental creature with Haste and Menace until the end of turn

If you go down this road, you might want to stretch to Grixis for Scrapheap Scrounger and be a less aggressive Mardu Vehicles deck

Sacrifice after IV.) I - Create two 1/2 white Moogle creature tokens with lifelink

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Youve probably got a few that came straight to mind if youve been collecting for a while or buying cheap bulk cards at every opportunity

Modern Horizons 3