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One of them being EDHREC which is the largest Commander data source currently available

The purpose of Ponder is not to net cards, but to find the correct card at the proper moment

Sultai Landfall Combo | FIN Standard | Travis Hall Creatures (24) 2 Marang River Regent 3 Famished Worldsire 3 Lumra, Bellow of the Woods 4 Galactic Wayfarer 4 Iridescent Vinelasher 4 Llanowar Elves 4 Overlord of the Balemurk Instants (4) 4 Bitter Triumph Sorceries (6) 2 Winternight Stories 4 Lich-Knights' Conquest The goal here is to get a copy of Famished Worldsire and Lumra, Bellow of the Woods into your graveyard so that you can return both with Lich-Knight's Conquest

Proliferate is a keyword action, so on certain cards, proliferate is part of a triggered ability