You get two flying 4/4s out of the deal, and the bonus of your creatures gaining indestructible
3 Shadow Summoning Shadow Summoning was clearly meant to be the next Lingering Souls, a great creature token spell from the Dark Ascension set
Although this effect does have a practical purpose within the game, it ultimately served moreso to just annoy your opponents, which is ultimately what lead to the card being completely banned
The crossover is set to launch on 13th June and is available to pre-order now

Foxglove Planeswalkers (1) Lands (38) 1 Brushland 4 Forest 4 Plains 1 Adarkar Wastes 4 Island 1 Sungrass Prairie 1 Skycloud Expanse 1 Yavimaya Coast 1 Terramorphic Expanse 1 Flooded Grove 1 Seaside Citadel 1 Exotic Orchard 1 Reliquary Tower 1 Glacial Fortress 1 Sunpetal Grove 1 Evolving Wilds 1 Seachrome Coast 1 Razorverge Thicket 1 Command Tower 1 Hinterland Harbor 1 Temple of Mystery 1 Temple of Enlightenment 1 Temple of Plenty 1 Prairie Stream 1 Canopy Vista 1 Thriving Heath 1 Thriving Isle 1 Thriving Grove 1 Overflowing Basin Spells (34) 1 Swords to Plowshares 1 Sol Ring 1 Fellwar Stone 1 Mind Stone 1 Farseek 1 Rites of Flourishing 1 Hoofprints of the Stag 1 Cultivate 1 Swiftfoot Boots 1 Riot Control 1 Illusionist's Gambit 1 Tempt with Discovery 1 Intellectual Offering 1 Thought Vessel 1 Ghirapur Orrery 1 Coveted Jewel 1 Simic Ascendancy 1 Generous Gift 1 Arcane Signet 1 Martial Impetus 1 Broken Wings 1 Secret Rendezvous 1 Perplexing Test 1 Promise of Loyalty 1 Wizard Class 1 An Offer You Can't Refuse 1 Tenuous Truce 1 Wear Down 1 Peerless Recycling 1 Long River's Pull 1 Tempt with Bunnies 1 Communal Brewing 1 Fisher's Talent 1 Perch Protection Family Matters TCGPlayer revealed the Family Matters deck

At this point, it becomes Angelic Enforcer , which still has Flying and gives you Hexproof, but now has power and toughness equal to your life total