1U
Instant
Flashback X, where X is the number of colours among creatures an opponent controls
up to X target artifact creatures get -1/-0 until end of turn

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3UUUUU
Ocotoy Iphephonosharin
Planeswalker - Ocotoy (Loyalty 3)
+2: you reveal cards from the top of your library until you reveal a instant or sorcery card, put that card into hand, and exile the rest.
-1: target untapped black creature gets -1/-0 until end of turn
-7: untap target land

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4RR
Creature - Goblin Samurai (1/1)
bushido 3
When ~this~ is exiled, target player may pay BRR. If that player does, up to four target Goblins get +1/-1 until end of turn for each permanent on the battlefield
Whenever ~this~ regenerates, you may Discard a card. If you don't, copy target instant or sorcery spell and you may choose new targets for the copy
--His rainstorm collapses even the most skilled advice
Albeit universe is greater than the fastest spark
– Folk Song (Trad.)

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AlexChurchill/MagicCardGenerator