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Equivalent cards to Krallenhorde Howler (which reduces creature costs in red/green):
1. Herald's Horn (cost reduction for a chosen creature type)
2. Urza's Incubator (cost reduction for a chosen creature type)
3. Ragemonger (reduces Minotaur costs, B/R)
4. Heartless Summoning (reduces all creature costs, but in black and creatures get -1/-1)
Most cost reducers in red/green are tribal-specific. Krallenhorde Howler is unique because it reduces all creature spells for you, but only as its transformed form from Duskwatch Recruiter.
