Its just that when people play white, but not black, they are far more likely to be playing less than the full collection of Moxes, perhaps because of cards like Null Rod
From there, you can use the mana from the Treasure to sacrifice the squirrel with Chatterfangs ability targeting some other creature, and if you hold priority, you can essentially give -X/-X infinitely to any creature and create infinite death and enter-the-battlefield triggers
Celes, Rune Knight On ETB, Celes, Rune Knight lets you pitch any number of cards, then draw that many plus one, and it pumps your whole team with +1/+1 counters when creatures enter from the graveyard
So do Vampiric Rites and casual favorite Priest of Forgotten Gods
It's not strictly necessary, but it is helpful in a lot of decks
If Megatron has deathtouch as the reflexive triggered ability resolves, 1 damage is lethal damage, and any amount beyond that is excess damage