This one is a pretty valuable feature
Emissary of Soulfire grants 3 Energy counters when it enters the battlefield and packs a great buff effect to spend that energy on
The price point keeps it out of most players handsunless, of course, you proxy
The only exceptions were the cards which let the user control when they phased out, such as Frenetic Efreet or Rainbow Efreet, and those which used the mechanic offensively, like Reality Ripple and Sapphire Charm
Part Birds of Paradise, part Scavenging Ooze, part Grim Lavamancer, the Shaman was banned in Modern and Legacy but never broke into Standard or Pioneer, although a critical mass of pseudo-fetchlands will eventually push it into playability
Smirking Spelljacker | Illustration by Borja Pindado Unlike steal effects like Act of Treason or Mind Control, theft cards let you keep control of your opponents spells permanently