Activated Abilities Blue players love to activate their abilities, and some times ramp is specifically for such effects
Failing this, if they assemble Tron, try disrupt them by taking out their expensive threats such as Karn Liberated, keeping in mind that you can also break up Tron at a later part of the turn using Field of Ruin
Erikas Invitation SAR (Pokmon Card 151) While not the most expensive card on the list, Erikas Invitation SAR is rising fast due to its stunning artwork and character-driven nostalgia
Collectr: Best All-Around App for Multiple Games If you collect more than one game, Collectr is the easiest one to recommend
Sorrow's Path can't tap for mana, and it also deals 2 damage to its controller and their creatures every time it becomes tapped for any reason
Box EV sits at ~39% of market price (6,000 vs 15,500) , which is standard for Pokemon TCG products