Dowsing Device

Artifact
Whenever this artifact or another artifact you control enters, up to one target creature you control gets +1/+0 and gains haste until end of turn. Then transform this artifact if you control four or more artifacts.
"A little innovation can lead to a big score."
—Admiral Beckett Brass
Geode Grotto
Land — Cave
(Transforms from Dowsing Device.)

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: Until end of turn, target creature gains haste and gets +X/+0, where X is the number of artifacts you control. Activate only as a sorcery.