defeat cards mtg Inevitable [Tarkir: Dragonstorm Prerelease Cards] Destroy target creature with power 2 or less. Defeat set Hour of Devastation

It can turn Equipment into burn damage to opponents and creatures, as well as cheat around equip costs

You just need the mana

The idea with mana dorks is that you tap them to add the mana they generate, and then return them to your hand to pay for web-slinging

All planeswalkers have a number of loyalty counters that they enter the battlefield with upon being cast called starting loyalty. Ashiok, Sculptor of Fears enters the battlefield with 4 loyalty counters

Compare this to commonly played three mana removal spells like Generous Gift - that leaves behind much bigger 3/3 but can smoke lands too (Ditto Beast Within)