That said, since getting to choose any target is naturally stronger than abilities that can hit only players or creatures, those naturally rank higher on the list, as do pingers with little to no mana costs associated with their pings and pingers that work with infinite combos
Obviously Tawnos, Urza's Apprentice + mana rocks + Paradox Engine is infinite mana, but saying "combos with Paradox Engine" is about as surprising as saying "this planeswalker is really good with Doubling Season!" There's more obscure combos out there though, such as pairing Tawnos with Sands of Time for infinite untaps / mana -- yes, Sands of Time is a real card that now has actual Commander potential
This cards ability, Resolute Heart, stops Pikachu ex from being knocked out by a single attack if it has full health before damage is applied
4 Ember Shot Red is a fairly weak color for drawing spells, so a red spell that cantrips is bound to have a higher mana cost than a blue spell that also cantrips