This is what stood out the most to me while reading the latest steemmonsters devlog update.
DEC'ing it up
Whenever you buy a card using DEC through the ingame store instead of using STEEM or any other card marketplace like peakmonsters, that DEC is going to be burned! That means that DEC amount will stop being an active asset. It will lower overall offer, raising prices.
Do you want to see the value of DEC go up? Then you should pay with DEC when you buy cards you would have bought anyway, either by getting some through steem-engine or using your own DEC earnt from ranked battles.
UPDATE - thanks 
Steemmonsters.CLUB
Hey, have you noticed how much my website has improved over the past few week?
Read, upvote and reply to some of the best #spt posts while waiting for a battle thanks to 's finallycomments.
Chat and get notified about battles on our community's Discord server.
Not a steemmonsters player yet? We offer free basic leases to anyone who wants to try steemmonsters, powerful card lease lotteries and even a steem faucet!
Remember, if you subscribe to us for 3 steem / week, you will get at least 3.3 steem back every 7 days, assuring 10% profit. Club members are also entered into an additional daily lottery.