Think of all the activated abilities in Standard alone: creature lands, exhaust, class cards, cycling, disguise, mana sinks, the list goes on
RP3 - 2PP - 2/2 When this comes into play, target player sacrifices a creature
Vorinclex, Monstrous Raider and to a lesser extent Carnage Tyrant are better individual cards in the green six department though, so ultimately the question is one of whether youre interested in driving archetypes or more powerful individual cards
More specifically, it was only available in 2009 in Fall Collector's Tins
Invasion of Tarkir / Defiant Thundermaw Tarkirs Invasion, aptly named Invasion of Tarkir, comes in at just two mana and deals at least two damage to any other target