During Main Phase 1, the turn player can: Summon monsters
cards are the ones for you
TCGplayer is usually better for standard singles sold to active players, while eBay wins for graded cards, sealed product, vintage, collections, and auctions of hard-to-price items
This board wipe thrives in a board state where you have access to more cards in play and in your hand than everyone else, and/or are playing a lot of lands in your deck
Kasla's last ability will trigger whether you tapped any creatures to pay for the spell or not, as long as it has convoke
Spoiler Main Deck: | Artifact Moralltach || Artifact Scythe ||| Artifact Failnaught || Artifact Vajra || Artifact Lancea || Artifact Caduceus | Artifact Achilleshield ||| Artifact Beagalltach | Artifact Aegis | Thunder King Rai-Oh || Aroma Jar ||| Dark Sanctuary ||| Card of Demise ||| Pot of Duality || Mystical Space Typhoon ||| Artifact Ignition ||| Artifact Sanctum ||| Call of the Haunted Extra Deck: || Gaia Dragon, the Thunder Charger || Constellar Ptolemy M7 | Number 21: Frozen Lady Justice | Wind-Up Arsenal Zenmaioh | Adreus, Keeper of Armageddon || Constellar Pleaides || Number 61: Volcasaurus || Artifact Durendal | Shark Fortress | Outer Entity Azaroth Conclusion: As always, the list above is just my personal build