Master Duel released in early 2022 to much excitement, and for good reason
I wonder if they were designed with this kind of expandability in mind
If this face-up card in its owner's control leaves the field because of an opponent's card effect: You can target 1 Machine monster in your GY

This deck contains the following cards:Monster (x27):Sacred Arch-Airknight Parshath (x2) - Ultra RarePower Angel Valkyria (x2) - Super RareEva (x3) - RareNeo-Parshath, the Sky Paladin (x2) - CommonAirknight Parshath (x2) - CommonMinerva, Scholar of the Sky (x2) - CommonBountiful Artemis (x2) - CommonMeltiel, Sage of the Sky (x3) - CommonHarvest Angel of Wisdom (x3) - CommonLayard the Liberator (x3) - CommonGuiding Ariadne (x3) - CommonSpell (x4):The Sanctum of Parshath (x2) - Super RareThe Sanctuary in the Sky (x2) - CommonTrap (x11):Rebirth of Parshath (x2) - Super RareLight of Judgment (x2) - CommonDivine Punishment (x2) - CommonSynthetic Seraphim (x2) - CommonSolemn Judgment (x1) - CommonSolemn Warning (x1) - CommonSolemn Strike (x1) - CommonBonus (x2):Synthetic Seraphim Token (x2) - Common This deck contains the following cards: Monster (x27): Spell (x4): Trap (x11): Bonus (x2):

While this card is face-up on the field, once per turn during your Main Phase, you can Normal Summon an "Alien" monster in addition to your Normal Summon or Set
It's also a lot more complicated due to this, but the premise of synchro summoning is that you combine monsters with the same level to summon powerful monsters from the Extra Deck