I recently covered five reasons your Commander deck might not be performing, and the most popular reasons and the two solutions that can have the biggest impact were, unsurprisingly, ramp and card draw
When this card declares an attack: You can place 1 Spell Counter on it
Given that Heart-eartH Dragon's original ATK is 0, the opponent would likely be damaged for the full amount of the ATK or DEF of their battling monster
Bloom Diva the Melodious Choir LIGHT 6 [ Fairy / Fusion / Effect ] 1 "Melodious Maestra" monster + 1 "Melodious" monster Cannot be destroyed by battle or card effects, also you take no battle damage from attacks involving this card
(2023-06-16) Amass abilities are now written as "amass [subtype] N." Previous cards with amass have received errata to say "amass Zombies N." (2023-06-16) To amass Orcs N, if you don't control an Army creature, create a 0/0 black Orc Army creature token
Seasonal Sequels Seasonal Sequels is 2023s holiday card and just so happens to the be the first holiday X-spell