You would better utilize the Progression System
C Common ST Starfoil UR Ultra Rare UL Ultimate Rare Related Cards View as Gallery View as List Abyss Shark X WATER Level 5 [ FishEffect ] ATK 1200 DEF 700 If this card is used for the Xyz Summon of a "Number" monster, it can be treated as a Level 3 or 4 monster
You can only Normal or Special Summon the following monsters from your hand, Deck, GY or banishment: Level 8 LIGHT monsters Level 8 EARTH monsters DARK Spellcaster monsters Any Extra Deck monster (excluding from GY or banishment) If you saw the "Any Extra Deck monster" part, you're reading that correctly
Earthen Goo I mostly play Commander, and I cant really see why Id want cumulative upkeep cards in one of Magics slower formats overall
Despite that, sometimes you have to acknowledge that a card is good, cheap, easy to play, but also absurdly boring