Ability costs can include ink (paid by exerting cards in your inkwell), exerted cards (paid by, well, exerting cards) or something else explained on the card itself
The only newer cards that managed to break into this higher portion of the graph are Voldaren EstateVoldaren Estate and Olivia's WrathOlivia's Wrath, two cards designed explicitly with Vampires in mind, with the latter resulting extremely powerful considering the go-wide theme of Edgar MarkovEdgar Markov decks
Creature - Rhino Color tag templates(None) Smoldering Egg Defender Whenever you cast an instant or sorcery spell, put a number of ember counters on this creature equal to the amount of mana spent to cast that spell
Who knows, that 3-5 life might end up being the difference between winning or not
While the price you find at a local store may be heavily influenced by your local community (if you have an active competitive scene, this could impact which cards sell), it can still be a good metric to contrast online prices against
Cards with the indestructible ability cant be sent to the graveyard (killed/destroyed) by taking lethal damage or by cards that say destroy