Tasigur, the Golden Fang can be cast at reduced cost if the player exiles cards from their graveyard while casting it. Once in play, one can pay mana to activate Tasigur's ability, which puts some cards in your graveyard, then makes an opponent choose one nonland card in your graveyard to return to your hand. Players may be tempted to exile as many lands as possible when casting Tasigur, so that their graveyard is full of spells, but by exiling spells and leaving more lands, the opponent does not get as many options about which nonland card to give you. [MTG] Sam Pardee on a common mistake using Tasigur, The Golden Fang
Tasigur, the Golden Fang can be cast at reduced cost if the player exiles cards from their graveyard while casting it. Once in play, one can pay mana to activate Tasigur's ability, which puts some cards in your graveyard, then makes an opponent choose one nonland card in your graveyard to return to your hand. Players may be tempted to exile as many lands as possible when casting Tasigur, so that their graveyard is full of spells, but by exiling spells and leaving more lands, the opponent does not get as many options about which nonland card to give you.