It's a potent card, then, that could become a middle-game nuisance for anyone playing against a deck with some solid Blue options, and notably dodges removal like Stand Up for Yourself
Spend this mana only to cast an instant or sorcery spell or to gain a Class level.": Level 3 you cast an instant or sorcery spell, that spell deals damage to each opponent equal to the number of instant and sorcery spells you've cast this turn
Now, its starting to make moves toward that without really addressing the underlying issues that lead to the mayhem in the first place
For example, Annihilate will be card advantage if it resolves normally targeting a creature an opponent controlsyou lose one card from your hand but you also draw a card, for a net gain of zero cards, and your opponent loses one card, so you're up one card relative to them
When this card is destroyed by battle and sent to the Graveyard or when this card you control is destroyed by an opponent's card effect and sent to your Graveyard: You can Special Summon 1 EARTH Pendulum Monster from your Deck in Defense Position, but destroy it during the End Phase
Entei SIR Fire, 270 HP Sacred Fire 150 + burn