[Codo]

I just checked the Cocards from the next season and found that one pair plays the follwong convention:

An opening of 2 ♥ shows a two suiter with one major and one minor, below opening strength, normally 5/5 or longer.

So, what is a good defence against this tool?

[shevek]

We never look at opponents' system cards.
We have a default defence to any call that shows suit A or suit B, such as Multi 2D, 2S as a minor pre-empt, etc. We double for tko of the higher-ranking, bid the suit step as tko of the other suit. All takeout shapes act immediately.
So, after Multi 2D,
X = tko of spades,
2H = tko of hearts.
This has worked pretty well, is reasonably common in England.

Against 2H, which is basically hearts or spades, it's misguided to double 2H as takeout of hearts. This allows them to sit in their best spot.
Say responder is 3-3 Majors. Double for tko allows them to play 2H. If you pass, they will have to play 3H or a non-fit. (See that huge Forcing Pass thread for that)

We would do as we usually do.
Dbl = takeout of spades "I would have doubled a natural 2S opening for tko"
2S = takeout of hearts (therefore passable)
You may think it's silly to lose the natural 2S overcall. Maybe but it's also silly to design a tailored defence to a rare bid. There are better things to do.
A consequence of this style is that delayed doubles of a major are strong penalty suggestions.
With
♠AJxx ♥KTxx ♦xx ♣AKx
we pass 2H then double 2S or 3H for penalty.