Your first grading submission can seem daunting, especially if you are sending your childhood cards
Sacrifice Murderous Redcap to Goblin Bombardment, dealing 1 damage to any target Redcaps Persist returns it with a -1/-1 counter Celes triggers, adding a +1/+1 counter to each creature you control The +1/+1 and -1/-1 counters cancel out Redcaps ETB ability resolves, dealing 2 damage to any target Repeat the loop for infinite damage and infinite ETB/death triggers Upgrade Your Combo Why stop at damage
Sure, children going into the store will be happy to spend their pocket change for a chance at a Charizard V, but selling cards at scale requires a lot of knowledge and ability to pivot
In fact, I would tend to prefer a 3-mana Walker that does this with a +1 over a 5-mana Walker that just draws a card and mills one (Jace, Memory Adept)
Abomasnow's Vigor Link makes its attacks cost less energy, while Crobat's Cunning Link can deal 30 damage to the active Pokmon