You can perform as many special summons in a turn as you have available resources to do so, there is no hard limit. Yes, you can use Rescue Cat to summon a Tuner and another monster, and then use them in a Synchro Summon - the turn has a restriction on normal summons, but not Special Summons.
(Also note, you do not 'tribute' the components for a Synchro Summon, you just send them to the graveyard.)
Building a good Tuner/Synchro deck centers on getting monsters out on the field as fast as you can to Synchro Summon. If you want to specialize in which Synchro Monster(s) you want to summon you can still start with these simple card combos:"Summoner Monk" - By using its effect you can quickly Special Summon a Level 4 Tuner monster from your deck then Synchro Summon for a Level 8 monster."Rescue Cat" - Use its effect to Special Summon a Level 3 or lower Tuner and a Level 3 or lower non-Tuner. Note that so far "X-Saber Airbellum" is the only Beast Tuner monster you will be able to summon."Maurading Captain" - Special Summon another Warrior Tuner to Synchro Summon."Black Salvo" - Special Summon a Level 4 DARK Machine and quickly summon a Level 7 Synchro Monster.
It is so good that it is now banned (september 2009 banlist). It could be used to OTK by using Demise or Rescue cat: Demise OTK 1. Use advanced ritual art to special summon Demise by discarding 2 mecanical chasers 2. Activate Demise's ability to clear the field 3. Summon Black Salvo and Retrieve a mecanical chaser 4. Synchro summon Dark Strike Fighter with black salvo and mecanical chaser 5. Attack with Demise then DSF 6. Tribute both for game Rescue Cat OTK 1. Summon Summoner Monk. Discard a spell to summon another 2. Discard one more spell and summon a Rescue Cat 3. Tribute rescue cat to summon 2 X saber airbellums 4. Synchro summon 2 DSF with all your monsters 5. Attack with both then tribute both monsters and you win if the field is clear
The duration of Special Rescue Exceedraft is 1800.0 seconds.
Special Rescue Exceedraft was created on 1992-02-03.
Special Rescue Exceedraft ended on 1993-01-25.
Kêtos Aithiopios (Ethiopian Monster) or Thêr Thalassios (Monster of the Deep).
The duration of Special Rescue Police Winspector is 1800.0 seconds.
Special Rescue Police Winspector ended on 1991-01-28.
Special Rescue Police Winspector was created on 1990-02-05.
Rescue Special Ops - 2009 is rated/received certificates of: Australia:M
Gator Boys - 2012 Monster Croc Rescue 4-9 was released on: USA: 29 September 2013
He showed the sea monster (Kraken/Cetus/Sea Monster >.>) the head of Medusa which kills anyone who sets eyes on it.