mtg arena how to get jumpstart cards Avatar Exclusives Bring Back Classic Commander Mechanic MTG Arena Jumpstart: Historic Horizons

I think signing cards help an artist in several ways

Atraxa, Praetors Voice and Vorinclex, Monstrous Raider both drastically speed up the Planeswalker Loyalty counters, and both are legal targets for Sisay to search and put directly onto the Battlefield

The consensus among the community is, that Rares from Summer Magic are rarer than Rares from Alpha , Magics first edition

Stock Up also got great synergy with the next card on my list

Captivating Crew, Thieving Amalgam, and Mass Mutiny to steal your opponents' creatures

He needs tons of flickers in his deck to get the most out of him in addition to Background-specific support pieces