Summoning sickness only stops creatures from attacking and activating abilities that use the tap symbol as a cost
Repeatable card draw is particularly valuable, helping you build momentum, and start to run away with the game
More Details:
The villain-branded holo ex from Team Rocket Returns trades around $900 raw across multiple trackers, and its graded trajectory has been vertical: PSA 10s went from $11,500 last November to $24,000 this year, with at least one mid-June sale reported far higher still
Note that as a combo-ish deck, you can be interupted quite easily on certain step, but the gameplan (always stick to the gameplan !) is : If you have parallel exceed : splash a mathmech to the field, preferably addition, soustraction using opponent cards, or sigma if needed