If you have enough mana to pay this cost, you can spend the required mana and place it on the battlefield
Abilities like Reckless however, dont specify that you have to challenge a character to benefit from it, so a Reckless character could choose to challenge a location instead - or may be forced to
Sword of Forge and Frontier Land and card draw The Swords of series in Magic: The Gathering run a gamut of usefulness, but all of them cost three mana, grant protection from two colours, add +2/+2 and provide some kind of benefit if you can hit a player with a creature equipped with them
Keep the pressure on and the battlefield churning, every attack brings you closer to victory
Mix Atraxa, Grand Unifier, a multi-format all-star, with one of the most iconic video game villains of all time, and you have potential for a serious price tag
A 1-mana creature that ramps you and fixes your mana is excellent, but one that also gains a bit of life or drains your opponent