Karlach, Fury of Avernus

Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase.
Choose a Background (You can have a Background as a second commander.)

Hardy Outlander

Commander creatures you own have "Whenever this creature attacks a player, if no opponent has more life than that player, another target creature you control gets +X/+X until end of turn, where X is this creature's power."

Nature's Lore

Search your library for a Forest card, put that card onto the battlefield, then shuffle.

Dolmen Gate

Prevent all combat damage that would be dealt to attacking creatures you control.

Three Visits

Search your library for a Forest card, put it onto the battlefield, then shuffle.

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