My fourth turn: at the begining of my upkeep i want to do this:
Before the suspended Rift Bolt resolves:
First i use Thermo-Alchemist ability, then cast Needle Drop,
after tap Thermo again, then cast Lightning Bolt,
then tap Thermo again, and after that Rift Bolt resolves and finally i use Thermo once more.
In Summary:
Use Thermo (ability resolves)>cast Needle (spell resolves)> use Thermo(resolves)>cast Lightning(resolves)>use Thermo(resolves)>suspended Rift Bolt resolves and i use Thermo once more
So the Question is: Can i use my spells and Thermo-Alchemist's ability like this?
Yes, you can. Suspend itself is a triggered ability (to remove the counter) that precedes the actual casting of the suspended spell. Nothing on the stack can resolve until both players pass priority, so you can use Thermo-Alchemist and instants as much as you can during your upkeep before the suspend triggered ability resolves.
Needle Drop Lightning BoltThermo-Alchemist Rift Bolt
Let's say the game is like this:
My First Turn: Not Important
My second Turn: Not Important
My third Turn: I play Thermo-Alchemist and i suspend Rift Bolt
My fourth turn: at the begining of my upkeep i want to do this:
Before the suspended Rift Bolt resolves:
First i use Thermo-Alchemist ability, then cast Needle Drop,
after tap Thermo again, then cast Lightning Bolt,
then tap Thermo again, and after that Rift Bolt resolves and finally i use Thermo once more.
In Summary:
Use Thermo (ability resolves)>cast Needle (spell resolves)> use Thermo(resolves)>cast Lightning(resolves)>use Thermo(resolves)>suspended Rift Bolt resolves and i use Thermo once more
So the Question is: Can i use my spells and Thermo-Alchemist's ability like this?