Why would I want to increase the costs of creatures that I cast?

Question

Geist-Fueled Scarecrow has an ability that says

Creature spells you cast cost 1 more to cast.

I don't see the strategy in casting a 4/4 creature and then penalizing myself for the added creature cast cost... Please elaborate, thanks!

Answer 1

There's a few ideas that spring to mind. The simple answer is that it's intended specifically as a downside. Most 4/4 creatures that cost {4} (without requiring specific types) have some sort of downside. If it didn't have the downside, it might not get printed.

Even if it's supposed to be a strict downside, though, there can still be unusual cases where you can take advantage of the downside. You could Donate it to an opponent and make them pay the extra costs. I guarantee you that at least one Zedruu the Greathearted player out there is running this. You can cast Etched Oracle for {5} and get a full sunburst. Maybe you want to use Hall of the Bandit Lord to cast a big creature and give it haste, but it has no generic mana in its mana cost. Are these strategies particularly strong or likely to see significant play? Probably not, but there's a lot of players who enjoy finding ways to take advantage of things intended to be downsides.

Answer 2

Under current rules, there does not seem to be any use for its ability, However, abilities of spells and creatures do not always have to be beneficial to their caster.

Many years ago, there was a rule called "mana burn". At the end of each phase or step, all players would lose all their unspent mana and lose that much life, and there are cards that punish you for having untapped lands. Having to pay extra mana for your creatures would allow you to evade both penalties. However, mana burn has always been a niche rule, and strategies building around it have been equally niche. Therefore, bringing a card that counters mana burn strategies would have been even more niche and practically irrelevant. Nowadays, with the mana burn rule long gone, even that niche use is non-existant.

The only explanation is that the Scarecrow's ability is simply a drawback to balance the card, because the overall power of a card depends on all of its characteristics such as cost, power/toughness, and abilities.