Because you're casting the spells during the resolution of Mnemonic Deluge, ignore any timing restrictions based on card type
Its an otterly unexpected access to a combo thatll really slap your opponents silly
The only social interaction players can participate in is choosing one of the preset speech bubble options that will appear above their avatar such as Hello!, Your turn, Thinking..., Nice! and Good game
Keymaster Rogue's last ability isn't optional
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Tezzeret, the Conspirator has a casting cost of two generic, one blue, and one black mana, enters the battlefield with five loyalty counters and has the following abilities (credit for ability translation goes to reddit user jack651411): +1: Create a colorless artifact token named "Etherium Stone," which has "Tap: Sacrifice this and add one mana of any color into your mana pool"