Helvault
{3}
Legendary Artifact
{1}, {T}: Exile target creature you control.
{7}, {T}: Exile target creature you don't control.
When ~this~ is put into a graveyard from the battlefield, return all cards exiled with it to the battlefield under their owners' control.
Winds of Abandon
{1}{W}
Sorcery
Exile target creature you don't control. For each creature exiled this way, its controller searches their library for a basic land card. Those players put those cards onto the battlefield tapped, then shuffle.
Overload {4}{W}{W} (You may cast ~this~ for its overload cost. If you do, change "target" in its text to "each.")