: Create a token that's a copy of target nonlegendary creature you control, except it has haste. Sacrifice it at the beginning of the next end step.
in its mana cost, X is 0.Kiki-Jiki, Mirror Breaker can turn the best nonlegendary creature on your battlefield into a repeatable effect. Tap him to create a hasty token copy, then sacrifice that token at the next end step. His own haste means the first activation is available immediately, making a five-mana investment capable of producing value before you pass the turn.
For a fair value plan, copy a creature such as Solemn Simulacrum or Imperial Recruiter. The token supplies another entry trigger, can attack or activate a suitable ability, and may offer a death trigger when it is sacrificed. Copying a creature with a useful tap ability can also matter because the token gains haste.
Zealous Conscripts provides a dedicated loop. Its copied token can target Kiki-Jiki with the entry ability, untapping him so he can create another Conscripts token. Repeating the sequence produces a growing army of hasty tokens while the pieces remain available. The copies are temporary, so the line typically aims to use them during that turn.
The target restriction is central: Kiki-Jiki cannot copy a legendary creature through his printed ability. He also does not copy counters, attached Equipment, or most temporary modifications. Choose a creature whose actual copied characteristics and entry abilities produce the result you want.
Three red mana symbols make reliable red sources important, even in a multicolor deck with strong copy targets. Keep the first activation in mind before casting him; a battlefield with no worthwhile legal target turns a powerful engine into a fragile setup piece. With a useful target ready, he can support incremental value, a sudden attack, or a planned combo without changing the rest of his basic operation.
