Its trigger will almost always put a creature and a land in your hand, and it'll keep your graveyard stocked, which for some decks is almost like having an entire second hand of cards to play with
You have to pay mana for the life, but you again get a permanent
Legality depends on the tournament format -- Unyielding Gatekeeper can be legal in some formats and banned or restricted in others
Discard with Triangular Holofoil Stamp Filler Card: Population 3
Pokey, the Scallywagg Pokey, the Scallywagg allows you some more flexibility when constructing a coin flip deck because you can now also include cards like Delina, Wild Mage and have their dice rolls count toward your total number of coin flips
The card was available exclusively through a lottery system in Japan, where applicants could enter for a chance to purchase the card at retail price