For example, after Pokmon Go launched a large number of Community Day events for popular Pocket Monsters, featuring larger odds at catching Shiny versions, they later brought them back in the form of Community Day Classics to give players another chance

3 Gagaga Magician 2 Gagaga Girl 3 Gagaga Sister 1 Gagaga Kid 1 Gagaga Head 1 Gagaga Mancer 1 Gagaga Gardna 2 Dododo Buster 2 Radian, the Multidimensional Kaiju 1 Kumongous, the Sticky Thread Kaiju 1 Dark Magician of Chaos 2 Black Fang Magician 1 Armageddon Knight 2 Downbeat 3 Gagagarevenge 1 Gagaga Academy Emergency Network 1 Gagagabolt 3 Onomatopaira 1 Dark Magic Veil 1 Chaos Scepter Blast 1 Interrupted Kaiju Slumber 1 Harpies Feather Duster 1 Foolish Burial 1 Monster Reborn 1 Twin Twisters 2 Dark Renewal 1 Number 39: Utopia 1 Gagaga Cowboy 1 Gagaga Samurai 1 Number 106: Giant Hand 1 Evilswarm Exciton Knight 1 Number S39: Utopia the Lightning 1 Number 33: Chronomaly Machu Mech 1 Number 39: Utopia Beyond 1 Constellar Ptolemy M7 1 Mecha Phantom Beast Dracossack 1 Divine Dragon Knight Felgrand 1 Number 81: Superdreadnought Rail Cannon Super Dora 1 Missus Radiant 1 Code Talker 1 Decode Talker

All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard
In a Dragon deck this will sweep all non-Dragons at the table, and thus save your team from sweepage, barring weird non-Dragon support stuff
Therefore, you first have to consider: What deck do I actually want to play