In addition to the base cost of the spell, three different tiers are available to select with different additional mana costs
Gimlis Reckless Might is a fantastic enchantment for this deck, giving your creatures haste, and it should be pretty easy to get that formidable trigger to fight an opposing creature
Amped Raptor, for example, generates two energy when it enters, and it then lets you spend energy counters instead of mana to cast spells exiled from the top of your library
In Sultai colors, you can do some nasty things with this, from using Buried Alive/Entomb early on to setup a great later turn, to just replaying the Maha, Its Feathers Night and Toxrill, the Corrosive that your opponents worked so so hard to get rid of
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Warren Instigator Some of the best goblin cards are just easy ways to play more goblins