So a tip to remember: though all Rares (no matter the level of rarity) are foil cards, not all foil cards are Rares so its definitely useful to know the difference between the symbols
The play pattern goes like this: you cast Taniwha and pass turn, then on your next turn you untap and Taniwha phases out, then on your next turn Taniwha phases back in and your lands phase out, on your next turn Taniwha phases back out and your lands phase in, etc
Some card variants dont have a market price at time of writing, and card prices are subject to change
However, opponents casting more than one spell per turn happens fairly often, which means you'll likely draw some cards out of Mangara's second trigger
Prosperous Partnership Prosperous Partnership plays to the board and ramps you in one efficient, rather scary package