As far as I can see and from what it seems to me, with it worded as "with at least 1 such tile on the board" I would say that they do not stack for the effects. His abilities deal decent damage but even with that it just doesn't seem like enough to be worth it.
Star-Lord (Legendary Outlaw) :starlord:
4 Star Rarity (Legendary) (Obviously)
At Max Level: HP: 10960 2960 base Tile damage: 73/64/11/82/10/11/4.0x
Sleight of Hand 10
urple:
Peter pulls the old switcheroo and swaps one of his enemy's possessions with a little surprise. He turns a selected non-Countdown tile into a 3-turn Countdown tile which deals 785 damage to the enemy.
Level 2: Countdown tile deals 1350 damage
Level 3: Countdown tile deals 1915 damage
Level 4: Can select Countdown tiles. 2 turn Countdown tile deals 2049 damage.
Level 5: Countdown tile deals 2504 damage, plus 731 damage to the enemy team.
Max Level: 4973/1451 damage.
Everyone With Me 7 :yellow:
Star-Lord quickly pulls together a plan - or at least most of one. Places a 3-turn Countdown tile. While at least one such tile is on the board, all friendly Red and Yellow ability costs are reduced by 1. (Dev note: This is placed on a random Yellow tile)
Level 2: Friendly Blue ability costs are reduced by 1.
Level 3: Places a 4 turn Countdown tile. Friendly Green ability costs are reduced by 1.
Level 4: Friendly Red, Blue, Green, Yellow ability costs are reduced by 2.
Level 5: Places a 5 turn Countdown tile. Friendly Red, Blue, Green, Purple, and Yellow ability costs are reduced by 2.
Oldest Trick in the Book 8 :red:
Star-Lord points past his enemy and shouts "Hey! Is that Beta Ray Bill?" before swinging in with a sucker punch. He creates a 2-turn Countdown tile which deals 612 damage. While at least one such tile is on the board, all enemy Red and Green ability costs are increased by 1. (Dev note: This is placed on a random Red tile)
Level 2: Deals 802 to the target enemy. Enemy Yellow ability costs are increased by 1.
Level 3: Places a 3 turn Countdown tile. Enemy Black ability costs are increased by 1.
Level 4: Deals 1897 to the target enemy. Enemy Red, Yellow, Green, and Black ability costs are increased by 2.
Level 5: Deals 3525 to the target enemy. Enemy Red, Yellow, Green, Black and Blue ability costs are increased by 2.
Max Level: 6998 damage.