Concordant Crossroads

Parallel Lives

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead.

Jyoti, Moag Ancient

When Jyoti, Moag Ancient enters the battlefield, create a 1/1 green Forest Dryad land creature token for each time you've cast your commander from the command zone this game. (They're affected by summoning sickness.)
At the beginning of each combat, land creatures you control get +X/+X until end of turn, where X is Jyoti's power.

Panharmonicon

If an artifact or creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.