Tapping a land and a creature for a single mana is quite bad, but lands like this have a home in decks that actively want to tap their own creatures
The creature you put onto the battlefield from your hand is blocking the attacking creature, even if the block couldn't legally be declared (for example, if that creature enters the battlefield tapped, or it can't block, or the attacking creature has protection from it)
These cards are based on Kisara, Mahad, and Mana, respectively, whose spirits all became signature monsters after their passing -- specifically Blue-Eyes White Dragon, Dark Magician, and Dark Magician Girl
Instant Color tag templates(None) Tainted Indulgence Draw two cards
Shinedust is consumed after a trade is offered, so, if you want to trade multiple cards of these rarities, make sure you have enough Shinedust