Keep the pressure on and the battlefield churning, every attack brings you closer to victory
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
When paired with tokens or graveyard recursion, this is an incredibly impactful ability that can repeatedly put an end to most threats on the board
If you have enough mana to pay this cost, you can spend the required mana and place it on the battlefield
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
Add this all together, Pioneer is likely to keep getting more expensive