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The creatures do have to be small enough of course, but many White decks are already interested in small low-to-the-ground creatures anyway

Generating mana does not give your opponent a chance to react with an instant spell or ability, but as you will usually use that mana to do something else, they'll have a chance to react then

Having access to this effect in the zone opens up new possibilities for deck building, especially when combos involving Exquisite Blood and Sanguine Bond are on the table

Very Cryptic Command: This spell allows you to choose two different options from a set of four, providing a tongue-in-cheek twist on the complexity of Cryptic Command

For example, if an effect says you can't cast more than one spell each turn, Irencrag Feat won't let you cast a second